X2121 : %THEOREM%

X2121 is a theorem.
Exercise:
EXISTS v(I) FORALL y(I) EXISTS z(I) .P(OIII) a(I) y [h(II) y] OR P v y [f(II) y] IMPLIES P v y z
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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