S : TYPEABBREV

S is a type abbreviation.
The type of natural numbers.

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S : WFFOP

S is a wff operation.
Substitute a term for the free occurrences of variable in a gwff.
 
The calling scheme for S is:

(S TERM VAR INWFF)
"GWFF" "GVAR" "GWFF"


The result is of type GWFF.

The arguments have the following meaning:
TERM : term
VAR : var
INWFF : inwff

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