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Proof step 11 from proof contains-subspec-better (
previous step
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⊦ same-subclasses(class, str, str0) ↔ (∀ class0. class∃(str0, class0) ∧ class0 ≤ class → class∃(str, class0)) ∧ (∀ class0. interface∃(str0, class0) ∧ class0 ≤ class → interface∃(str, class0))
A spec-lemma