redid proofs to use "always" rather than "reachable" (somewhat)
redid proofs to use "always" rather than "reachable" (somewhat)

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