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Just a few set-sounding operations on lists. If you want sets, use
the `Set' module.
unionLists :: Eq a => [a] -> [a] -> [a]
intersectLists :: Eq a => [a] -> [a] -> [a]
minusList :: Eq a => [a] -> [a] -> [a]
disjointLists :: Eq a => [a] -> [a] -> Bool
intersectingLists :: Eq a => [a] -> [a] -> Bool
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