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Proof step 57 from proof prepost-write-orphans (previous step)

avol = avol1[n, mapped(mkbuf(0))], buf = buf0, err = err0, m = 0, m0 = n, n0 = # buf0, n1 = 0, n < # avol1, ebm-vol-inv(avol1[n, mapped(mkbuf(0))]), ebm-vol-inv(avol1), is-aligned(# buf0, EB_PAGE_SIZE), is-encoded-pad(orphans0, # orphans0, buf0), # buf0 ≤ LEB_SIZE, ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ [choose n2 with n2 < n0 ∧ is-aligned(n2, EB_PAGE_SIZE) in if n2 ≠ 0 then avol[m0] := mapped(avol[m0].data + mkempbuf(m - # avol[m0].data) + subarray(buf, n1, n2)) ifnone skip] ( ebm-vol-inv(avol) → (err = ESUCCESS ∨ ⌊err⌋ ) ∧ id○(avol, avol1, n) ∧ (err = ESUCCESS → avol[n].mapped? ∧ is-encoded-pad(orphans0, # orphans0, avol[n].data))), err = ESUCCESS

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Rule argument

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