| rkv = rk × val, validvals(str, rkvs0, st), validvals(str, rkvs1, st), rkv ∈ rkvs0 ⊦ validval(str, rk, val, st[rkvs1]) |
validvals(str, rkvs0, st), validvals(str, rkvs1, st), rk × val ∈ rkvs0 ⊦ validval(str, rk, val, st[rkvs1])
[[CONCRETESIMPRULES : ()]]