| path∃(str, r, r1, st), path∃(str, r1, r0, st) ⊦ sk = _type, unchangedNorec(r1, st, st[r0 -- sk, val]), path∃(str, r, r0, st), junkref(str, r, st) |
⊦ path∃(str, r, r0, st) ∧ path∃(str, r0, r1, st) → path∃(str, r, r1, st)
[[CONCRETESIMPRULES : ()], [EXTRATERMS : (str, r, r1, st, r0)]]