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assert (1..<3).contains(2)

assert 4 == (0..4)[-1]

assert ['a', 'b', 'c'] == ('a'..'f')[0..2]

list = ['a', 'b', 'c', 'd', 'e']
list[1..1] = [1,2,3,4]
assert ['a', 1, 2, 3, 4, 'c', 'd', 'e'] == list