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Proof step 20 from proof pseq-subset (
previous step
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⊦ cyclic(str, r0, st) ∧ is_obj(str, r, st) ∧ st[r -- fs '] = refval(r0) ∧ fs ' ∈ instfields(st[r -- _type] .type .class) ∧ is_reftype(fs .type) ∧ st[r0 -- _type] .type ≤ fs .type → cyclic(str, r, st)
A spec-lemma