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Alex Rivera
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What is the best way to turn a Map[A, Set[B]] into a Map[B, Set[A]] ? For example, how do I turn a Map(1 -> Set("a", "b"), 2 -> Set("b", "c"), 3 -> Set("c", "d")) into a Map("a" -> Set(1), "b" -> Set(1, 2), "c" -> Set(2, 3), "d" -> Set(3)) (I'm using immutable collections only here. And my real problem has nothing to do with strings or integers. :)
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