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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