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MiniZinc

predicate fzn_subgraph(array[int] of $$N: from, array[int] of $$N: to,
array[$$N] of var bool: ns, array[int] of var bool: es) =
forall(e in index_set(from)) (
(es[e] -> ns[from[e]]) /\ (es[e] -> ns[to[e]])
);
%-----------------------------------------------------------------------------%