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based on an earlier version of the Wolfram Language.
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Tally

Tally[list]
tallies the elements in list, listing all distinct elements together with their multiplicities.
Tally[list, test]
uses test to determine whether pairs of elements should be considered equivalent, and gives a list of the first representatives of each equivalence class, together with their multiplicities.
  • Tally[list] lists distinct elements in the order they appear in list.
New in 6