| junkrefs(str, refs, ty, st1), st ⊆ st1 ⊦ junkrefs(str, refs, ty, st) |
⊦ ¬ junkrefs(str, [], ty, st)
∀ str, ty, st1, st. junkrefs(str, acc, ty, st1) ∧ st ⊆ st1 → junkrefs(str, acc, ty, st), junkrefs(str, r + acc, ty, st1), st ⊆ st1 ⊦ junkrefs(str, r + acc, ty, st)
[[CONCRETESIMPRULES : ([CSIMPGEN : references generated by [], +;])]]