predicate fzn_steiner_reif(int: N, int: E, array[int] of int: from, array[int] of int: to, array[int] of int: w,
                           array[int] of var bool: ns, array[int] of var bool: es, var int: K,
                           var bool: b) =
  abort("Reified steiner constraint is not supported");
   
%-----------------------------------------------------------------------------%
