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Proof step 5 from proof junkref-subspec-samesubclasses (
previous step
)
⊦ ¬ is_obj(str, r, st) ∧ is_obj(str0, r, st) → ¬ same-subclasses-contains(st[r -- _type] .type .jtelemtype .class, str, str0)
Lemma
same-subclasses-is-obj