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Code Block
def s1=[1,2,3,4,5,6], s2=[4,5,6,7,8,9]
def diff = (s1 as Set) + s2
tmp = s1 as Set
assert diff == [1,2,3,7,8,9] as Set

Sorted Sets

A sorted set is one with extra methods that utilize the sorting of the elements. It's often more efficient than doing the same with lists.