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Specification refset
actualize set-union

with gref
by morphism : set → refset; : elem → ref; ∅ → ∅; ++ → ++; # → #; { } → { }; ∪ → ∪; ∩ → ∩; \ → \; -- → --; ∈ → ∈; ⊆ → ⊆; s → rs; s0 → rs0; s1 → rs1; 
            s2 → rs2; a → r; b → r0; c → r1;
end actualize