SUBST-SOME-OCCS : WFFOP

SUBST-SOME-OCCS is a wff operation.
Tests whether a wff is the result of replacing 0 or more
occurrences of a term by another in a given wff.
 
The calling scheme for SUBST-SOME-OCCS is:

(SUBST-SOME-OCCS REPLACED-TERM IN-WFF REPLACED-BY-TERM RESULT-WFF)
"GWFF" "GWFF" "GWFF" "GWFF"


The result is of type BOOLEAN.

The arguments have the following meaning:
REPLACED-TERM : Term to be Replaced
IN-WFF : Wff in which to Replace Term
REPLACED-BY-TERM : Term Replacing
RESULT-WFF : Resulting Wff

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