NTHARG : WFFOP

NTHARG is a wff operation.
Move to the nth argument of a functional application,
or to the nth disjunct, conjunct, etc.
 
The calling scheme for NTHARG is:

(NTHARG N GWFF)
"INTEGER+" "GWFF"


The result is of type GWFF.

The arguments have the following meaning:
N : Number of argument (0 means the function)
GWFF : NIL

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