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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