PRT-INFIX-OP : WFFOP

PRT-INFIX-OP is a wff operation.
Returns NIL, if the argument is not an infix operator,
its binding priority otherwise.
 
The calling scheme for PRT-INFIX-OP is:

(PRT-INFIX-OP GWFF)
"GWFF"


The result is of type ANYTHING.

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