:(1:2) a

0 = {a == (5:2)}

0 = {a == (1:3)}

1 = {a == (1:2)}

:[1,2,3] b

0 = {b == a}

0 = {b == []}

0 = {b == [3,1,2]}

0 = {b == [1,2,3,4]}

1 = {b == [1,2,3]}