⊦ st[[]] = st
∀ st, rk. (st[rkvs0][rk]) = st[rk] ∨ rk ∈ rkvs0 ⊦ (st[rkv + rkvs0][rk]) = st[rk], rk ∈ rkv + rkvs0
[[CONCRETESIMPRULES : ([CSIMPGEN : refkeyvalues generated by [], +;])]]