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Proof step 1 from proof valid-peb-valid-vidhdr (conclusion)

⊦ valid-peb(v, m, mkpeb(aehdr, avhdr, buf, m0, boolvar)) → avhdr.valid?

System applied rule normalize

And obtained the following new goals

Proof step 2:
valid-peb(v, m, mkpeb(aehdr, avhdr, buf, m0, boolvar)) ⊦ avhdr.valid?

Rule argument

Additional information