X5212 : %THEOREM%

X5212 is a theorem.
Exercise:
LAMBDA z(A) EXISTS x(B) [g(OB) x AND z = f(AB) x] = % f g
All rules and commands, including ADVICE, 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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