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Set operation on array constant

[3,3] & [3,3]               # => [3] [3,3] | [3,3]               # => [3] [1,2,3,3] - [1]             # => [2, 3, 3] [1,2,3,3] - [3]             # => [1, 2] [1,2,3,3] - [2,2,3]         # => [1]