X2135 : %THEOREM%

X2135 is a theorem.
Exercise:
EXISTS x(I) FORALL y(I) .P(OI) x AND Q(OI) y IMPLIES Q x OR P 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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