-er bbb bbe bbi bbk bbl bbr be- beb bee bei bek bel ber bi- bib bie bii bik bil bir bkb bke bkk bkl bkr blb ble bli blk bll blr brb bre bri brk brl brr ebb ebe ebi ebk ebl ebr eeb eee eek eel eer eib eie eii eik eil eir ekb eke eki ekl ekr elb ele eli elk ell elr erb ere eri erk erl err ibb ibe ibi ibk ibl ibr ie- iee iei iek iel ier iib iie iii iil iir ikb ike iki ikk ikl ikr il- ilb ile ili ilk ill ilr ir- irb ire iri irk irl irr kbb kbe kbi kbk kbl kbr ke- keb kee kei kek kel ker kib kie kii kik kil kir kkb kke kki kkk kkl kkr kl- klb kli klr kri krk krl krr lbb lbe lbi lbk lbl lbr leb lee lei lek lel ler lib lie lii lik lil lir lkb lkl lkr llb lle lli llk lll llr lrb lri lrk lrr rbb rbe rbi rbk rbl rbr re- reb ree rei rek rel rer rib rie rii rik ril rir rkb rke rkk rle rli rll rlr rrb rri rrk rrl rrr