mapVarSet = mapUniqSet
sizeVarSet = sizeUniqSet
filterVarSet = filterUniqSet
-extendVarSet_C combine s x = addToUFM_C combine s x x
-delVarSetByKey = delFromUFM_Directly -- Can't be bothered to add this to UniqSet
+extendVarSet_C = addOneToUniqSet_C
+delVarSetByKey = delOneFromUniqSet_Directly
elemVarSetByKey = elemUniqSet_Directly
\end{code}