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List Subsets in Groovy (inspired from Java 8 in Action#13.2.4)
def list = [1,4,9]
println subsets(list)
List<List<Integer>> subsets(List<Integer> list) {
if(!list) {
return [[]]
final List<List> directSubs = list.tail().collect {
return [list.head(), it]
} + [list.tail()]
return ([[list.head()]] + directSubs + subsets(list.tail())).unique()
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