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Theorem exvalidrefs

¬ junkref(str, r, st), ¬ cyclic(str, r, st), is_obj(str, r, st), r ≠ jvmref, ∀ ty. type∃(str, ty) → (ty ≤ st[r -- _type] .type ↔ ty = st[r -- _type] .type), ∃ fs. fs ' ∈ instfields(st[r -- _type] .type .class) ∧ fs .type = st[r -- _type] .type ⊦ ∃ refs. validrefs(str, refs, st[r -- _type] .type, st) ∧ refs ≠ [] ∧ refs .first = r ∧ refs .last = jvmref

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