-er -ol bbb bbe bbi bbk bbl bbo bbr be- beb bee bei bek bel beo ber bi- bib bie bii bik bil bio bir bkb bke bkk bkl bko bkr blb ble bli blk bll blo blr bob boe boi bok bol boo bor brb bre bri brk brl bro brr ebb ebe ebi ebk ebl ebo ebr eeb eee eek eel eeo eer eib eie eii eik eil eio eir ekb eke eki ekl eko ekr elb ele eli elk ell elo elr eo- eob eoe eoi eok eol eoo eor erb ere eri erk erl ero err ibb ibe ibi ibk ibl ibo ibr ie- iee iei iek iel ier iib iie iii iil iio iir ikb ike iki ikk ikl iko ikr il- ilb ile ili ilk ill ilo ilr io- iob ioe ioi iol ioo ior ir- irb ire iri irk irl iro irr kbb kbe kbi kbk kbl kbo kbr ke- keb kee kei kek kel keo ker kib kie kii kik kil kio kir kkb kke kki kkk kkl kkr kl- klb kli klo klr kob koe koi kok kol koo kor kri krk krl kro krr lbb lbe lbi lbk lbl lbo lbr leb lee lei lek lel leo ler lib lie lii lik lil lio lir lkb lkl lkr llb lle lli llk lll llo llr lob loe loi lok lol loo lor lrb lri lrk lro lrr o-i ob- obb obe obi obk obl obo obr oeb oee oei oel oeo oer oib oie oii oik oil oio oir okb oke oki okk okl oko okr olb ole oli olk oll olo oo- oob ooi ook ool ooo oor or- orb ore ori ork orl oro orr rbb rbe rbi rbk rbl rbo rbr re- reb ree rei rek rel reo rer rib rie rii rik ril rio rir rkb rke rkk rko rle rli rll rlo rlr rob roe roi rok rol roo ror rrb rri rrk rrl rrr