| n < # apebs, valid-recs(apebs, wlar, recs), valid-vtbl-weak(apebs, n), is-encoded(vtbl, apebs[n].data), VTBL_VOLID × VTBL_LNUM ∈ recs, recs[VTBL_VOLID × VTBL_LNUM].pnum = n, # apebs = # wlar ⊦ ⟪ubi_init_vols_sizes#(recs, wlar, apebs; vtbl, vols)⟫ (valid-vtbl(apebs, vols, wlar, n) ∧ unmapped-vols(vols) ∧ ¬ VTBL_VOLID ∈ vols) |