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Proof step 5 from proof synced-unmap (previous step)

⟨if synced(avol) ∧ m0 < # avol ∧ buffered(m0) ≠ bleb then avol[m0] := unmapped else abort⟩ (avol = avol1), # lpt = # avol, m = m1, m0 = m2, m2 < # avol, awbuf-inv(avol, bleb), synced(avol), avol0 ↓ avol1 ⊦ buffered(m2) = bleb, synced(avol1), avol0 ↓ avol

Heuristic symbolic execution applied rule if positive left

And obtained the following new goals

Rule argument

pos: left 1

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