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Proof step 3 from proof validref-subspec-samesubclasses (
previous step
)
⊦ ¬ junkref(str0, r, st) ∧ same-subclasses-contains(st[r -- _type] .type .jtelemtype .class, str, str0) → ¬ junkref(str, r, st)
Lemma
junkref-subspec-samesubclasses