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on-restart-benchmarks/share/minizinc/std/fzn_partition_set_reif.mzn
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MiniZinc

include "all_disjoint.mzn";
predicate fzn_partition_set_reif(array[int] of var set of int: S,
set of int: universe,
var bool: b) =
b <-> ( all_disjoint(S) /\ universe == array_union(i in index_set(S)) ( S[i] ) );