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dekker.one
1predicate fzn_range_reif(array[int] of var int: x, var set of int: s,
2 var set of int: t,
3 var bool: b) =
4 b <-> (
5 % All values in 's' must map to a value in 't'.
6 forall(i in ub(s)) (
7 i in s -> x[i] in t
8 ) /\
9 % All values in 't' must be mapped from a value in 's'.
10 forall(i in ub(t)) (
11 i in t -> exists(j in ub(s)) ( j in s /\ x[j] == i )
12 )
13 );