Ensure
Lists

List Frequency

Count how often each item appears, and find the unique ones.

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Guides that cover this

Sorting and deduplicating a list without surprisesWhy "10" sorts before "2", how umlauts change places between Germany and Sweden, which duplicates really count as duplicates, and why a random comparator is a biased shuffle.

Related tools

Remove Duplicate Lines
Strip duplicate lines from a list, with optional trimming and case folding.
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Sort Lines
Sort lines alphabetically, numerically, by length, or shuffle them randomly.
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Reverse List
Flip the order of a list from bottom to top.
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Rotate List
Shift every item up or down, wrapping around the ends.
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