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Theorem refine-change

m < # avol, n ≤ # buf, n ≤ LEB_SIZE, is-aligned(n, EB_PAGE_SIZE), avol = abs(avols[v]), ebm-vol-inv(avol), v ∈ avols, v = default-volid, ebm-cons(avols) ⊦ ⟪ebm_vol_change#(m, n, buf, v; avols; err)⟫ ⟨ebm_avol_change#(m, n, buf; avol; err0)⟩ (avol = abs(avols[v]) ∧ err = err0)

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