| r -- fv .1 ∈ st, r ∈ st ⊦ validFields(r, fis + fv ', st) ↔ validFields(r, fis, st), fv .1 = _length, fv .1 = _type, fv .1 ∈ fis |
fv = sk × val, r -- sk ∈ st, r ∈ st ⊦ validFields(r, fis + fv ', st) ↔ validFields(r, fis, st), sk = _length, sk = _type, sk ∈ fis
[[CONCRETESIMPRULES : ([CSIMPELIM : ⊦ sk = fv .1 ∧ val = fv .2 ↔ fv = sk × val])], [EXTRATERMS : (fv, sk, val)]]