NOT-WFFEQ : WFFOP

NOT-WFFEQ is a wff operation.
Check, whether two wffs are not the same.
 
The calling scheme for NOT-WFFEQ is:

(NOT-WFFEQ WFF1 WFF2)
"GWFF" "GWFF"


The result is of type BOOLEAN.

The arguments have the following meaning:
WFF1 : wff1
WFF2 : wff2

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