Pair which is Comparable.compare(a, b) lexicographically compares the pair
a with the pair b.compare(a, b, c, d) lexicographically compares the pair
(a, b) with the pair (c, d).equals for Pairs works almost the same as for objects, minus
checking for whether the other object is of the same class.Comparable.Comparable and Serializable.Serializable.Pair which is Serializable.Iterable of pairs (k, v) to
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