RPIN : WFFOP

RPIN is a wff operation.
Prompt for a replaceable symbol and the name of a replacement
and replace the first occurrence of the symbol.
 
The calling scheme for RPIN is:

(RPIN INWFF)
"GWFF"


The result is of type GWFF.

The arguments have the following meaning:
INWFF : Wff to Replace Symbol in

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