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Proof step 53 from proof validref-subspec-samesubclasses (
previous step
)
⊦ same-subclasses-contains(class, str, str0) ∧ class0 ≤ class ∧ tdname+∃(str0, class) → same-subclasses-contains(class0, str, str0)
Lemma
same-subclasses-subclass