SIMPLIFY-DOWN is a wff operation.
Apply any active rewrite rule
A --> B or A <--> B to the current gwff in the forward direction.
(i.e. subformulas A are rewritten to B, modulo any functions
attached to the rules, so that the resulting formula will be a
rewrite instance of the original formula.)
The calling scheme for SIMPLIFY-DOWN is:


The result is of type GWFF.

The arguments have the following meaning:
GWFF : gwff before rewriting

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