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Frontier AI technical interview question bank.

Practice coding, system design, behavioral, and project questions for frontier AI roles.

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Home
Question bank

Frontier AI technical interview question bank.

Practice coding, system design, behavioral, and project questions for frontier AI roles.

Company

FREE PRACTICE

Public demos, always pinned.

Start with either demo. They remain here when you filter or sort.

Free account: sign in to practice the marked Free questions.

Newest published questions; deterministic, never randomized.

Demo 1Number search with delayed feedback
Demo 2Design real-time device monitoring and control

Question bank filters

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Question groups

Filter question bank by interview groupAll 161 Coding 161 System design 0 Behavioral 0 Hiring manager 0 Project deep dive 0

Topics

Filter question bank by topic tagsAll 269 Python 161 Algorithms 40 Data structures 46 Concurrency 27 Distributed systems 7 Storage & state 43 Networking 7 Reliability 30 ML / AI 27 Data / SQL 24 Security 7 Product design 25 Communication 66

Independent and not affiliated with the companies represented. Collected material does not predict future interview questions.

149 questions

Sort question bankSortFree first Newest Oldest AI ratio ↓AI ratio ↑

Question bank results

Every question has a public brief with the task, constraints, and follow-ups. Labels describe interactive practice access.

Free practice

Topic tags
Python
Algorithms

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Minimum Interval Removals

Given intervals [start, end], remove as few as possible so that the remaining intervals do not overlap. Intervals that only touch at an endpoint are compatible.

Practice focusAssume every interval satisfies start <= end . The input may be unsorted and may contain duplicates. Target O(n log n) time. Staged follow-ups 1. Return the retained or removed interval indices. 2. Assign positive weights and maximize retained weight rather than retained count. 3. Handle online arrivals and explain which guarantees can no longer be optimal.

Free practice

Topic tags
Python
Algorithms

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Number of Islands

Given a rectangular grid of characters, where '1' is land and '0' is water, return the number of edge-connected land components. Diagonal cells are not connected.

Practice focusThe grid may be empty. You may either mutate the grid or maintain separate visited state, but state your choice. Target O(rows columns) time. Staged follow-ups 1. Return the area of the largest island. 2. Count islands as land cells are added incrementally. 3. Process a grid too large to hold fully in memory, one row at a time.

Free practice

Topic tags
Python
Data structures

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Reverse a Singly Linked List

Given the head of a singly linked list, reverse its links in place and return the new head.

Practice focusDo not allocate a second list. An empty list and a one-node list should be returned unchanged. The iterative solution should use O(1) auxiliary space. Staged follow-ups 1. Provide a recursive implementation and compare its space usage. 2. Reverse only the nodes between positions left and right . 3. Reverse nodes in fixed-size groups while leaving a final short group unchanged.

Free practice

Topic tags
Python

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Valid Bracket Sequence

Given a string containing only (, ), [, ], {, and }, determine whether every opener is closed by the matching type in the correct order.

Practice focusThe empty string is valid. A closing bracket with no pending opener is invalid, as is any opener left at the end. Target O(n) time and O(n) worst-case space. Staged follow-ups 1. Ignore brackets inside quoted strings while respecting escape characters. 2. Report the location and expected token for the first mismatch. 3. Validate a stream incrementally across chunk boundaries.

Free practice

Topic tags
Python
Data / SQL

xAICoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Earliest Completion Time in a Data Pipeline

A pipeline consists of tasks (inputs, output, duration). A dataset never produced by any task is a source available at time 0. A task may start as soon as every input is available, and independent tasks run in …

Practice focusImplement: Return the earliest time at which goal is available. A goal that is already a source returns 0 . Reject negative durations, duplicate output producers, dependency cycles, and unknown goals with ValueError . Durations are non-negative non-boolean integers; dataset names are strings. A known source is a dataset mentioned as an input but never produced; an arbitrary unmentioned name is unknown. Validate the complete pipeline, including cycles disconnected from the goal. Duplicate input names do not require multiple executions.…

Free practice

Topic tags
Python

xAICoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Fixed-Window Token Limiter

Implement a per-key limiter with one shared token limit and fixed window length. Commands are:

Practice focus- ("ALLOW", key, cost, timestamp) : accept if the key's usage plus cost does not exceed the limit; a rejected request consumes nothing. - ("RESET", key, timestamp) : clear that key's usage in the fixed window containing timestamp . The window containing time t starts at (t // window) window . Costs are non-negative integers; zero is allowed. Preserve input order. Return one result per command, using booleans for ALLOW and a consistent acknowledgment for RESET .…

Free practice

Topic tags
Python

AnthropicCodingAI-generated

Talk-through codingNo local grader

Reported interview periodNot available

Seat row

During a timed test, mark seats as taken and report the first free seat.

Practice focusOnline assessment. A row of seats is numbered from 1. Implement take, which marks a free seat as taken and fails if that seat is already taken. Implement first free, which returns the lowest numbered free seat, or reports that the row is full. Then the test adds a second row and asks you to search the first row before the second. Write both functions and one example of a full row.

Free practice

Topic tags
Python

AnthropicCodingAI-generated

Talk-through codingNo local grader

Reported interview periodNot available

Two name lists

On a phone screen, merge two sorted name lists and keep one copy of a shared name.

Practice focusPhone screen. You are given two lists of names. Each list is already in alphabetical order. Return one list in that order. A name that appears in both lists appears once. An empty list stays empty. Then the interviewer adds a name that appears twice in the first list and asks you to keep one. State that rule, then write the function.

Free practice

Topic tags
Python

AnthropicCodingAI-generated

Talk-through codingNo local grader

Reported interview periodNot available

Shift notes

Keep the notes from a shift and return them in the order they were written.

Practice focusCoding round. A shift collects notes. Add a note for a person, and reject a blank note. Return every note in the order it was written. Then return the notes from one person only, still in that order. Write the functions and one example with two people.

Free practice

Topic tags
Python

AnthropicCodingHalf AI-generated

Python codingWebAssembly + public tests

Reported interview periodNot available

Build an Unbiased Randomness Adapter

Turn an unknown biased bit source into balanced choices, a sampled load estimate, and isolated concurrent batches.

Practice focusYou receive a hardware source raw bit() that independently returns 0 or 1 with one stable but unknown probability of returning 1 . The probability is strictly between zero and one, and no other random source is available. Implement the following four functions. Requirements 1. Extract balanced bits Read the raw source in fresh pairs. Discard pairs whose values match. For the first pair whose values differ, return its first value. A scripted source raises EOFError when exhausted; let that exception propagate, including for a partial pair.…

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

First position of a target in a sorted array

Given a nondecreasing array and a target value, report where the target first appears, or -1 when it is missing. A logarithmic search is expected, even though the same value may occur many times.

Practice focusRequirements - Line one is the element count n . Line two holds the n space-separated integers in nondecreasing order, and is empty when n is 0. Line three is the target. - Return the smallest zero-based index holding the target, as a decimal string with no padding. - Return -1 when the array is empty or the target never appears. - Repeated values are expected, so an ordinary equality hit is not enough; after a match keep searching to the left while remembering the best index seen. - Keep the running time logarithmic in n .…

Free practice

Topic tags
Python
Concurrency

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Per-function exclusive runtime from a call log

A single thread records start and end events for nested function calls. For each function id, work out how many time units it actually spent running, excluding the units spent inside calls it made.

Practice focusRequirements - Line one is the number of functions; ids run from 0 to count - 1 and every id appears at least once. Line two is the number of event lines. - Each remaining line is <id :<start|end :<timestamp with integer fields. Events are chronological and properly nested on one thread. - An end timestamp is inclusive: the unit at that timestamp belongs to the call that is ending, so it contributes timestamp - previous + 1 units. - When a call begins on top of a running call, credit the units since the previous boundary to the caller.…

Free practice

Topic tags
Python
Data structures

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Maximum haul from non-adjacent houses

Each house on a street holds a known amount of money, and robbing two neighboring houses on the same night trips the alarm. Choose houses with no two adjacent to collect the largest possible total.

Practice focusRequirements - Line one is the house count. Line two lists that many non-negative integer amounts, separated by spaces. - Adjacency is positional, so choosing the house at index i rules out only i - 1 and i + 1 . - Return the best total as a decimal string with no separators. - A single house contributes its own amount, and a zero amount is a legal choice, so a street of zeros answers 0 . - Every house is a candidate; skipping a house is never required just because it is small. - run case passes case["stdin"] to solve .…

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Values unique to the first list

Two Python-style lists arrive as literal assignments. Collect every value that belongs to the first list but not the second, keeping the first list's order.

Practice focusRequirements - The input holds two assignment statements, one per entry: list1 = [...] followed by list2 = [...] . Both lists contain integers and may be empty. - The statements may be separated by a real newline or by a literal two-character \n escape; split on either form. - Return the kept values in their original list1 order. - Membership in list2 is decided by value, not by count or position, so a single occurrence there removes every matching occurrence in list1 .…

Free practice

Topic tags
Python
Algorithms

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Longest run of distinct characters

Given a string, measure the longest contiguous stretch in which no character repeats. Report only the length of that stretch.

Practice focusRequirements - The input is a single string, and the trailing newline is not part of the payload. - A stretch must be contiguous, and every character inside it must be distinct. - Return the length as a decimal string, not the slice itself and not its starting position. - Characters compare exactly, so an uppercase and a lowercase letter are different characters. - A string whose characters all match answers 1 , and the longest stretch may sit anywhere in the payload.…

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Peak simultaneous bookings

Given a list of half-open time ranges, report the largest number of ranges that are active at the same instant.

Practice focusRequirements - Line 1 holds the number of bookings. Each following line holds start end , two integers with start strictly less than end . - Treat a booking as occupying the half-open interval [start, end) . - Because the interval is half-open, a booking that ends at a time does not conflict with one that starts at that same time. - Return the peak number of concurrent bookings as a decimal string. - An empty booking list returns "0" . - run case(case: dict) forwards case["stdin"] to solve .…

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Merge three ordered lists without repeats

Combine three nondecreasing integer lists into one nondecreasing list in which every distinct value appears once, then print it as a single space-separated line.

Practice focusRequirements - The input has exactly three lines. Each line starts with a count k followed by k nondecreasing integers. - The merged result must stay sorted and must contain each distinct value exactly once. - Values may be negative, zero, or positive. Duplicates can appear within one line and across lines. - Print the distinct values in one line separated by single spaces, with no leading or trailing space. - If all three lists are empty, return an empty string. - run case(case: dict) forwards case["stdin"] to solve .…

Free practice

Topic tags
Python
Data structures

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Next arrangement in lexicographic order

Rearrange an integer list into the next larger lexicographic arrangement, wrapping around to the smallest arrangement when no larger one exists.

Practice focusRequirements - Line 1 holds the length n . Line 2 holds n integers separated by spaces. - Compare arrangements position by position from the left. The next arrangement is the smallest arrangement strictly greater than the current one. - Duplicate values are allowed. - If the current arrangement is already the largest, return the smallest arrangement, with values in ascending order. - Print the resulting list in one space-separated line, keeping the same length and the same multiset of values. - run case(case: dict) forwards case["stdin"] to solve .…

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Count distinct values in an ordered list

Given a nondecreasing integer sequence, report how many different values it contains.

Practice focusRequirements - The input is one line of space-separated integers in nondecreasing order. - Equal values are therefore adjacent, and the sequence may contain negative values. - Return the number of distinct values as a decimal string. - You do not need to print or return the compacted sequence itself. - run case(case: dict) forwards case["stdin"] to solve . - Do not append a trailing newline to the returned string; return the value exactly once.

Free practice

Topic tags
Python
Algorithms

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Zero rows and columns around each zero

Given a matrix, set every cell in a row or column that contains a zero to zero, deciding which rows and columns to clear from the original values rather than from the partially rewritten matrix.

Practice focusRequirements - Line 1 is rows cols . The next rows lines each hold cols integers. - For every cell that is 0 in the original matrix, its entire row and entire column become 0 . - Decide all affected rows and columns before writing any zeros, so zeros created by the update must not widen the cleared area. - Return the matrix with rows in their original order, values separated by single spaces and rows separated by newlines, with no extra text. - A matrix with no zeros is returned unchanged. - run case(case: dict) forwards case["stdin"] to solve .…

Free practice

Topic tags
Python
Storage & state

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Normalize an absolute filesystem path

Read one absolute path and return its canonical form: empty segments and . segments disappear, .. folds into the parent, and exactly one slash separates the surviving directories.

Practice focusRequirements - The input is a single absolute path; it may repeat separators and may end with a slash. - A whole segment equal to . is dropped; only a whole segment equal to .. means "go up". - .. removes the most recently kept segment; when nothing is left to remove it has no effect, so climbing past the root stays at the root. - Join the remaining segments with one leading slash, no doubled slashes, and no trailing slash. - Return / alone when no segment survives.…

Free practice

Topic tags
Python
Data structures
Product design

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Dot product of two long integer vectors

Read a shared length and two integer vectors of that length, then return their dot product as a decimal string. Most entries are zero, so the useful work should follow the non-zero positions rather than the dec…

Practice focusRequirements - Line 1 is the length n ; line 2 holds n integers for the first vector; line 3 holds n integers for the second. - Some inputs carry the two characters backslash and n instead of real line breaks; treat both forms as line separators before parsing. - Multiply matching positions, then add the products. Entries may be negative, so the sum can be negative or zero. - Return the total as a plain decimal string with no padding, no plus sign, and no newline. - Do not print the individual products or the operand vectors.…

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Detect any contiguous run with a target sum

Given an integer array and a target, decide whether some non-empty contiguous run adds up to exactly that target.

Practice focusRequirements - The first line holds the element count and the target, separated by a space; the second line holds the values. - Return True when at least one such run exists and False otherwise, with exactly that capitalization and no other text. - Values may be negative or zero, so a partial sum that drifts away from the target is not evidence that no run exists. - A single element equal to the target counts, and a run may include zero-valued elements. - Stop as soon as a match is found; later runs do not change the answer.…

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Water held between bars

Bars of width one stand along a line at the given heights. Return how many units of water stay trapped between them after it rains.

Practice focusRequirements - Line 1 is the bar count; line 2 lists the height of each bar from left to right. - The water above a bar is bounded by the shorter of the tallest bars on its left and on its right, minus the bar's own height. - Bars at the two ends hold nothing, and a stretch that only falls or only rises holds nothing. - Return the total as a decimal string with no per-bar breakdown and no trailing newline. - Heights are non-negative integers; the total fits in ordinary integer arithmetic. - An input with zero or one bar traps nothing.

Previous2 of 7Next

Browse all original practice

Build a token-budget batcher
Sliding-window rate limiter
Interval calendar
Nested dictionary transforms
Command-log store
Dependency-ready scheduler
Streaming metric window
Evaluation slice aggregator
Build a reliable job runner
Build one adaptable decision story
Defend your role fit
Prepare one project deep dive
Design an evaluation artifact registry
Defend a reversible launch decision
Negotiate an ambiguous role scope
Trace a project from claim to evidence
Choose between two urgent priorities
Resolve a cross-functional disagreement
Own a consequential failure
Increase a team’s leverage
Warm a cold cache without a thundering herd
Ship a 500 GB checkpoint without a startup stampede
Make every document decision traceable to evidence
Share eight GPUs between two workloads with different promises
A mutable indexed sequence that must restart exactly
Trace a falling unit price to a rising bill
Keep a very long conversation usable while it streams
Design durable scheduled publishing
Make speculative code edits safe to accept
Recover a grouping rule from two-word phrases

CONTENT BOUNDARY

Independent frontier AI interview practice. Includes adaptations of collected interview material and original exercises; not official company questions and not affiliated with the companies represented. Collected material does not predict future interview questions. Report a correction.

Loading the question catalog…

FREE PRACTICE

Public demos, always pinned.

Start with either demo. They remain here when you filter or sort.

Free account: sign in to practice the marked Free questions.

Newest published questions; deterministic, never randomized.

Demo 1Number search with delayed feedback
Demo 2Design real-time device monitoring and control

Question bank filters

Reset filters

Question groups

Filter question bank by interview groupAll 161 Coding 161 System design 0 Behavioral 0 Hiring manager 0 Project deep dive 0

Topics

Independent and not affiliated with the companies represented. Collected material does not predict future interview questions.

149 questions

Sort question bankSortFree first Newest Oldest AI ratio ↓AI ratio ↑

Question bank results

Every question has a public brief with the task, constraints, and follow-ups. Labels describe interactive practice access.

Free practice

Topic tags
Python
Algorithms

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Minimum Interval Removals

Given intervals [start, end], remove as few as possible so that the remaining intervals do not overlap. Intervals that only touch at an endpoint are compatible.

Free practice

Topic tags
Python
Algorithms

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Number of Islands

Given a rectangular grid of characters, where '1' is land and '0' is water, return the number of edge-connected land components. Diagonal cells are not connected.

Free practice

Topic tags
Python
Data structures

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Reverse a Singly Linked List

Given the head of a singly linked list, reverse its links in place and return the new head.

Free practice

Topic tags
Python

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Valid Bracket Sequence

Given a string containing only (, ), [, ], {, and }, determine whether every opener is closed by the matching type in the correct order.

Free practice

Topic tags
Python
Data / SQL

xAICoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Earliest Completion Time in a Data Pipeline

Free practice

Topic tags
Python

xAICoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Fixed-Window Token Limiter

Implement a per-key limiter with one shared token limit and fixed window length. Commands are:

Free practice

Topic tags
Python

AnthropicCodingAI-generated

Talk-through codingNo local grader

Reported interview periodNot available

Seat row

During a timed test, mark seats as taken and report the first free seat.

Free practice

Topic tags
Python

AnthropicCodingAI-generated

Talk-through codingNo local grader

Reported interview periodNot available

Two name lists

On a phone screen, merge two sorted name lists and keep one copy of a shared name.

Free practice

Topic tags
Python

AnthropicCodingAI-generated

Talk-through codingNo local grader

Reported interview periodNot available

Shift notes

Keep the notes from a shift and return them in the order they were written.

Free practice

Topic tags
Python

AnthropicCodingHalf AI-generated

Python codingWebAssembly + public tests

Reported interview periodNot available

Build an Unbiased Randomness Adapter

Turn an unknown biased bit source into balanced choices, a sampled load estimate, and isolated concurrent batches.

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

First position of a target in a sorted array

Given a nondecreasing array and a target value, report where the target first appears, or -1 when it is missing. A logarithmic search is expected, even though the same value may occur many times.

Free practice

Topic tags
Python
Concurrency

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Per-function exclusive runtime from a call log

A single thread records start and end events for nested function calls. For each function id, work out how many time units it actually spent running, excluding the units spent inside calls it made.

Free practice

Topic tags
Python
Data structures

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Maximum haul from non-adjacent houses

Each house on a street holds a known amount of money, and robbing two neighboring houses on the same night trips the alarm. Choose houses with no two adjacent to collect the largest possible total.

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Values unique to the first list

Two Python-style lists arrive as literal assignments. Collect every value that belongs to the first list but not the second, keeping the first list's order.

Free practice

Topic tags
Python
Algorithms

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Longest run of distinct characters

Given a string, measure the longest contiguous stretch in which no character repeats. Report only the length of that stretch.

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Peak simultaneous bookings

Given a list of half-open time ranges, report the largest number of ranges that are active at the same instant.

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Merge three ordered lists without repeats

Combine three nondecreasing integer lists into one nondecreasing list in which every distinct value appears once, then print it as a single space-separated line.

Free practice

Topic tags
Python
Data structures

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Next arrangement in lexicographic order

Rearrange an integer list into the next larger lexicographic arrangement, wrapping around to the smallest arrangement when no larger one exists.

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Count distinct values in an ordered list

Given a nondecreasing integer sequence, report how many different values it contains.

Free practice

Topic tags
Python
Algorithms

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Zero rows and columns around each zero

Given a matrix, set every cell in a row or column that contains a zero to zero, deciding which rows and columns to clear from the original values rather than from the partially rewritten matrix.

Free practice

Topic tags
Python
Storage & state

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Normalize an absolute filesystem path

Read one absolute path and return its canonical form: empty segments and . segments disappear, .. folds into the parent, and exactly one slash separates the surviving directories.

Free practice

Topic tags
Python
Data structures
Product design

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Dot product of two long integer vectors

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Detect any contiguous run with a target sum

Given an integer array and a target, decide whether some non-empty contiguous run adds up to exactly that target.

Free practice

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Water held between bars

Bars of width one stand along a line at the given heights. Return how many units of water stay trapped between them after it rains.

Previous2 of 7Next

Browse all original practice

Build a token-budget batcher
Sliding-window rate limiter
Interval calendar
Nested dictionary transforms
Command-log store
Dependency-ready scheduler
Streaming metric window
Evaluation slice aggregator
Build a reliable job runner
Build one adaptable decision story
Defend your role fit
Prepare one project deep dive
Design an evaluation artifact registry
Defend a reversible launch decision
Negotiate an ambiguous role scope
Trace a project from claim to evidence
Choose between two urgent priorities
Resolve a cross-functional disagreement
Own a consequential failure
Increase a team’s leverage
Warm a cold cache without a thundering herd
Ship a 500 GB checkpoint without a startup stampede
Make every document decision traceable to evidence
Share eight GPUs between two workloads with different promises
A mutable indexed sequence that must restart exactly
Trace a falling unit price to a rising bill
Keep a very long conversation usable while it streams
Design durable scheduled publishing
Make speculative code edits safe to accept
Recover a grouping rule from two-word phrases

CONTENT BOUNDARY