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CountDistinctBy

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Counts distinct values of a function applied to each element

CountDistinctBy[{e1, e2, …}, f]
CountDistinctBy[f]
CountDistinctBy[{{a, x}, {a, y}, {b, z}}, First] → 2CountDistinctBy[{1, 2, 3, -2, -3}, Abs] → 3
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