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dekker.one
1predicate fzn_range(array[int] of var int: x, var set of int: s,
2 var set of int: t) =
3 % All values in 's' must map to a value in 't'.
4 forall(i in ub(s)) (
5 i in s -> x[i] in t
6 ) /\
7 % All values in 't' must be mapped from a value in 's'.
8 forall(i in ub(t)) (
9 i in t -> exists(j in ub(s)) ( j in s /\ x[j] == i )
10 );