⊦ ¬ rk ∈ st ∧ onlyModified(r, st, st0) → ¬ rk ∈ st0
⊦ ¬ onlyModified(r, st, st0) → ¬ onlyModified(r, st0, st)
[[CONCRETESIMPRULES : ()], [EXTRATERMS : (rk, st0, r, st)]]