úΨ       .              ! setops-0.1.1 Data.SetOpsInsertinsert Singleton singletonEmptyempty Intersection intersectionUnionunionSubsetOf isSubsetOfProperSubsetOfisProperSubsetOfMembermember∈∉∋∌⊂⊄⊃⊅⊆⊈⊇⊉∪∩∅