Complement¶ Returns elements in the first list but not in any of the other lists. $ wo 'Complement[{1, 2, 3, 4, 5}, {2, 4}]' {1, 3, 5} $ wo 'Complement[{a, b, c, d}, {b, d}]' {a, c} $ wo 'Complement[{1, 2, 3}, {1, 2, 3}]' {} $ wo 'Complement[{1, 2, 3, 4}, {2}, {4}]' {1, 3}