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DeleteDuplicates

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DeleteDuplicates[list]

deletes duplicates from list.

DeleteDuplicates[list, test]

deletes elements from list based on whether the function test yields True on pairs of elements.

DeleteDuplicates does not change the order of the remaining elements.

• • DeleteDuplicates[{1, 7, 8, 4, 3, 4, 1, 9, 9, 2, 1}]

• • DeleteDuplicates[{3,2,1,2,3,4}, Less]