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At 25.26 there is a not-wff as an answer. It seems to make sense if "for all z" is ignored?
+James Dow Thanks very much for pointing this out. I just put in a note.
At 25.26 there is a not-wff as an answer. It seems to make sense if "for all z" is ignored?
+James Dow Thanks very much for pointing this out. I just put in a note.