b-p bbb bbe bbi bbl bbp be- beb bee bei bel bep bi- bib bie bii bil bip blb ble bli bll blp bpb bpe bpi bpl bpp ebb ebe ebi ebl ebp eeb eee eel eep eib eie eii eil eip elb ele eli ell elp ep- epb epe epi epl epp ibb ibe ibi ibl ibp ie- iee iei iel iep iib iie iii iil iip il- ilb ile ili ill ilp ipb ipe ipi ipl ipp l-p lbb lbe lbi lbl lbp leb lee lei lel lep lib lie lii lil lip llb lle lli lll llp lpb lpe lpi lpl lpp p-p pbb pbe pbi pbl pbp peb pee pei pel pep pib pie pii pil pip plb ple pli pll plp ppb ppe ppi ppl ppp