reintroduced "metis" call taken out after reintroducing "set" as a constructor, and added two "metis" calls that used to be too slow
reintroduced "metis" call taken out after reintroducing "set" as a constructor, and added two "metis" calls that used to be too slow

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle