| validval(str, rk0, val0, st), validval(str, rk, val, st) ⊦ validval(str, rk0, val0, st[rk, val]) |
validval(str, r -- sk, val0, st), validval(str, rk, val, st) ⊦ validval(str, r -- sk, val0, st[rk, val])
[[CONCRETESIMPRULES : ([CSIMPGEN : refkey generated by --;])]]