| pebs[m0] = mkpeb(buf0, m1, false), m0 < # pebs, mtd-cons(pebs), EB_PAGE_SIZE ≤ PEB_SIZE, err = ESUCCESS → is-encoded(ehdr, subarray(buf0, 0, EB_PAGE_SIZE)), err = ESUCCESS ∨ ⌊err⌋ ⊦ ⟪skip⟫ true, err = ESUCCESS, subarray(buf0, 0, EB_PAGE_SIZE) = emptypage |