| refs = r + refs0, validrefs(str, refs, mkclasstype(`java.lang.Object' .class), st0), st ⊆ st0 ⊦ refs = [], path∃(str, r, refs .last, st), junkref(str, r, st) |
st ⊆ st0, validrefs(str, r ' + refs0, mkclasstype(`java.lang.Object' .class), st0) ⊦ junkref(str, r, st), path∃(str, r, (r ' + refs0) .last, st)
[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPSEQ : ⊦ r ' + refs ≠ []], [CSIMPSEQ : ⊦ r + refs = r ' + refs])]]