X2120 : %THEOREM%

X2120 is a theorem.
Practice Exercise:
FORALL u(I) FORALL v(I) FORALL w(I) [P(OII) u v OR P v w] IMPLIES EXISTS x(I) FORALL y(I) P x y
All 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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