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At: squash functionality wrt iff
  P,Q:Prop. (P  Q)  (P  Q)
By: (Unfold `guard` 0) THEN (RepeatMFor 4 (Analyze 0))
THEN
(BackThru Thm* (P  Q)  P  Q)
THEN
HypBackchain

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About:
propimpliesall
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PrintForm Definitions Lemmas core StandardLIB Doc