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]