X2134 : %THEOREM%

X2134 is a theorem.
Exercise:
FORALL z(I) EXISTS x(I) [FORALL y(I) P(OII) x y OR Q(OII) x z] IMPLIES FORALL y EXISTS x .P x y OR Q x y
You may not use ADVICE, but all other rules and commands are allowed.
Only book theorems may be ASSERTed as lemmas without proof.
For a complete list of book theorems, type PROBLEMS.
No more help available. Sorry.

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