-er bbb bbe bbi bbk bbr be- beb bee bei bek ber bez bi- bib bie bii bik bir biz bkb bke bkk bkr brb bre bri brk brr brz bze bzr bzz ebb ebe ebi ebk ebr eeb eee eek eer eib eie eii eik eir ekb eke eki ekr erb ere eri erk err erz eze ezr ezz ibb ibe ibi ibk ibr ibz ie- iee iei iek ier iib iie iii iir ikb ike iki ikk ikr ir- irb ire iri irk irr ize izi izz k-z kbb kbe kbi kbk kbr kbz ke- keb kee kei kek ker kez kib kie kii kik kir kiz kkb kke kki kkk kkr kri krk krr rbb rbe rbi rbk rbr re- reb ree rei rek rer rez rib rie rii rik rir riz rkb rke rkk rkz rrb rri rrk rrr rzb rze zbb zbr zeb zee zek zer zez zib zie zik zir ziz zzr zzz