REPLACE-GRR : WFFOPREPLACE-GRR is a wff operation.
Replace the right-hand side of an infix operator non-destructively.
The calling scheme for REPLACE-GRR is:
(REPLACE-GRR GWFF NEWGRRWFF)
The result is of type GWFF.
The arguments have the following meaning:
GWFF : gwff
NEWGRRWFF : New grr
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