⊦ st[(rk × val) ' + rkvs] = (st[rk, val][rkvs])
⊦ rk ∈ rkvs → (st[rk, val][rkvs]) = st[rkvs]
[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (rkvs + rkvs0) + rkvs1 = rkvs + rkvs0 + rkvs1])]]