21 Because each noun is a synonym of itself, anaphors in StrSet v1 /StrSet v2 that do have a string-matching antecedent candidate will already be covered by the WordNet look-up prior to back-off in almost all cases: Back-off string matching will take effect only if the anaphor/antecedent head noun is not in WordNet at all.
the described back-off will most of the time just amount to a recency back-off.