bbb bbe bbi bbk bbl be- beb bee bei bek bel bi- bib bie bii bik bil bkb bke bkk bkl blb ble bli blk bll ebb ebe ebi ebk ebl eeb eee eek eel eib eie eii eik eil ekb eke eki ekl elb ele eli elk ell ibb ibe ibi ibk ibl ie- iee iei iek iel iib iie iii iil ikb ike iki ikk ikl il- ilb ile ili ilk ill kbb kbe kbi kbk kbl ke- keb kee kei kek kel kib kie kii kik kil kkb kke kki kkk kkl kl- klb kli lbb lbe lbi lbk lbl leb lee lei lek lel lib lie lii lik lil lkb lkl llb lle lli llk lll