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Proof step 8 from proof validrefnotnull-isvalidref (conclusion)

str ≠ `java.lang.Object' ⊦ validrefnotnull(str0, r, mkclasstype(((* str)) .class), st) → (is_valid_ref(str0, r, st) ↔ is_obj(str0, r, st))

Special step normalize

And obtained the following new goals