X5206 : %THEOREM%

X5206 is a theorem.
Exercise:
% f(AB) [x(OB) UNION y(OB)] = % f x UNION % f y
All rules and commands, including ADVICE, are allowed.
You may ASSERT the following theorems, without proof, as lemmas : (X5200
X5204)
You may also ASSERT any book theorem (type PROBLEMS for a list of them).
No more help available. Sorry.

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