DIST-CTR* : EDOPDIST-CTR* is an editor command.
Recursively apply the distributive laws to a wff in
the contracting direction:
(A and B) or (A and C) --> A and (B or C)
(A or B) and (A or C) --> A or (B and C)
(B and A) or (C and A) --> (B or C) and A
(B or A) and (C or A) --> (B and C) or A.
The command format for DIST-CTR* is:
The result replaces the current wff.
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