| is_indexkey(fv .1) ⊦ addclass(class, fv ' + fis, st) = addclass(class, fis, st) |
fv = sk × val, is_indexkey(sk) ⊦ addclass(class, fv ' + fis, st) = addclass(class, fis, st)
[[CONCRETESIMPRULES : ([CSIMPELIM : ⊦ sk = fv .1 ∧ val = fv .2 ↔ fv = sk × val])], [EXTRATERMS : (fv, sk, val)]]