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Theorem hidingok-def

⊦ hidingok(lext, rext, lren, rren, hideext) ↔ oinj(hideext) ∧ osurj(hideext) ∧ (∀ e. hideext(e) = None ↔ (∃ la, ra. lren(la) = rren(ra) ∧ Some(e) = lext(la) ∧ Some(e) = rext(ra)))