-er -ol bbb bbe bbk bbl bbn bbo bbr be- beb bee bek bel ben beo ber bkb bke bkk bkl bkn bko bkr blb ble blk bll bln blo blr bnb bne bnk bnl bnn bno bnr bob boe bok bol bon boo bor brb bre brk brl brn bro brr ebb ebe ebk ebl ebn ebo ebr eeb eee eek eel een eeo eer ekb eke ekl eko ekr elb ele elk ell eln elo elr en- enb ene enk enl enn eno enr eo- eob eoe eok eol eon eoo eor erb ere erk erl ern ero err kbb kbe kbk kbl kbn kbo kbr ke- keb kee kek kel ken keo ker kkb kke kkk kkl kkn kkr kl- klb klo klr kn- kne knk knl knn kno knr kob koe kok kol kon koo kor krk krl krn kro krr lbb lbe lbk lbl lbo lbr leb lee lek lel len leo ler lkb lkl lkr llb lle llk lll lln llo llr lnb lne lnk lnl lnn lno lnr lob loe lok lol lon loo lor lrb lrk lrn lro lrr nbb nbe nbk nbl nbn nbo nbr ne- neb nee nek nel nen neo ner nke nkk nkn nko nkr nlb nle nlk nll nln nlo nlr nnb nne nnk nnl nnn nno no- nob noe nok nol non noo nor nrb nre nrk nrl nrn nro nrr ob- obb obe obk obl obn obo obr oeb oee oel oen oeo oer okb oke okk okl oko okr olb ole olk oll oln olo on- onb one onk onl onn ono onr oo- oob ook ool oon ooo oor or- orb ore ork orl orn oro orr rbb rbe rbk rbl rbn rbo rbr re- reb ree rek rel ren reo rer rkb rke rkk rko rle rll rln rlo rlr rnb rnn rno rnr rob roe rok rol ron roo ror rrb rrk rrl rrn rrr