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Proof step 5 from proof unique-sqns-update (previous step)

m < # apebs, ∀ v, m. unique-elems(valid-sqns(v, m, apebs)) ⊦ (∀ v, m0. unique-elems(valid-sqns(v, m0, apebs[m, mkpeb(aehdr, avhdr, buf, m1, boolvar)]))) ↔ ¬ valid-peb(mkpeb(aehdr, avhdr, buf, m1, boolvar)) ∨ ¬ avhdr.sqn ∈ valid-sqns(avhdr.vol, avhdr.leb, apebs) \ (valid-peb(avhdr.vol, avhdr.leb, apebs[m]) ⊃ {apebs[m].vidhdr.sqn} ;∅)

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 1

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