-er -ol b-u bbb bbe bbk bbl bbn bbo bbr bbu be- beb bee bek bel ben beo ber beu bkb bke bkk bkl bkn bko bkr blb ble blk bll bln blo blr blu bnb bne bnk bnl bnn bno bnr bnu bob boe bok bol bon boo bor bou brb bre brk brl brn bro brr bru bub bue buk bul bun buo bur buu ebb ebe ebk ebl ebn ebo ebr ebu eeb eee eek eel een eeo eer ekb eke ekl eko ekr eku elb ele elk ell eln elo elr elu en- enb ene enk enl enn eno enr enu eo- eob eoe eok eol eon eoo eor eou erb ere erk erl ern ero err eru eu- eub eue eul eun eur kbb kbe kbk kbl kbn kbo kbr kbu ke- keb kee kek kel ken keo ker kkb kke kkk kkl kkn kkr kku kl- klb klo klr klu kn- kne knk knl knn kno knr knu kob koe kok kol kon koo kor kou krk krl krn kro krr kru kub kue kuk kul kun kur kuu lbb lbe lbk lbl lbo lbr lbu leb lee lek lel len leo ler leu lkb lkl lkr llb lle llk lll lln llo llr llu lnb lne lnk lnl lnn lno lnr lnu lob loe lok lol lon loo lor lou lrb lrk lrn lro lrr lru lub lue luk lul lun luo lur luu nbb nbe nbk nbl nbn nbo nbr nbu ne- neb nee nek nel nen neo ner neu nke nkk nkn nko nkr nku nlb nle nlk nll nln nlo nlr nlu nnb nne nnk nnl nnn nno nnu no- nob noe nok nol non noo nor nou nrb nre nrk nrl nrn nro nrr nru nub nue nuk nul nun nuo nur nuu ob- obb obe obk obl obn obo obr obu oeb oee oel oen oeo oer okb oke okk okl oko okr oku olb ole olk oll oln olo olu on- onb one onk onl onn ono onr onu oo- oob ook ool oon ooo oor or- orb ore ork orl orn oro orr oru ou- oue ouk oul oun ouo our rbb rbe rbk rbl rbn rbo rbr rbu re- reb ree rek rel ren reo rer reu rkb rke rkk rko rku rle rll rln rlo rlr rlu rnb rnn rno rnr rnu rob roe rok rol ron roo ror rou rrb rrk rrl rrn rrr rru rub rue ruk run ruo rur ruu ubb ube ubk ubl ubn ubo ubr ubu ueb uee uel uen uer ukb uke ukk ukl ukn ukr uku ulb ule ulk ull uln ulo ulr ulu un- unb une unk unl unn uno unr unu uob uoe uok uol uon uoo uor ur- urb ure urk url urn uro urr uru uue uun uur uuu