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functor PairKeyFn (structure I : ORD_KEY
structure J : ORD_KEY)
: ORD_KEY where type ord_key = I.ord_key * J.ord_key = struct
type ord_key = I.ord_key * J.ord_key
fun compare ((i1, j1), (i2, j2)) =
case I.compare (i1, i2) of
EQUAL => J.compare (j1, j2)
| ord => ord
end
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