-er -ol bbb bbe bbg bbk bbl bbn bbo bbr be- beb bee beg bek bel ben beo ber bgb bge bgg bgk bgl bgn bgo bgr bkb bke bkg bkk bkl bkn bko bkr blb ble blg blk bll bln blo blr bnb bne bng bnk bnl bnn bno bnr bob boe bog bok bol bon boo bor brb bre brg brk brl brn bro brr ebb ebe ebg ebk ebl ebn ebo ebr eeb eee eeg eek eel een eeo eer egb ege egg egl egn ego egr ekb eke ekg ekl eko ekr elb ele elg elk ell eln elo elr en- enb ene eng enk enl enn eno enr eo- eob eoe eog eok eol eon eoo eor erb ere erg erk erl ern ero err gbe gbg gbk gbl gbn gbo gbr ge- geb gee geg gek gel gen geo ger ggb ggg ggn ggo ggr gkb gkn gko glb gle glg glk gll gln glo glr gnb gne gnl gnn gno gnr gob goe gog gok gol gon goo gor grb gre grg grk grl grn gro grr kbb kbe kbk kbl kbn kbo kbr ke- keb kee keg kek kel ken keo ker kgb kgl kgo kkb kke kkk kkl kkn kkr kl- klb klg klo klr kn- kne kng knk knl knn kno knr kob koe kog kok kol kon koo kor krg krk krl krn kro krr lbb lbe lbg lbk lbl lbo lbr leb lee leg lek lel len leo ler lgb lge lgg lgk lgl lgn lgo lgr lkb lkg lkl lkr llb lle llg llk lll lln llo llr lnb lne lng lnk lnl lnn lno lnr lob loe log lok lol lon loo lor lrb lrg lrk lrn lro lrr nbb nbe nbg nbk nbl nbn nbo nbr ne- neb nee neg nek nel nen neo ner ngb nge ngg ngk ngl ngn ngo nke nkk nkn nko nkr nlb nle nlg nlk nll nln nlo nlr nnb nne nng nnk nnl nnn nno no- nob noe nog nok nol non noo nor nrb nre nrg nrk nrl nrn nro nrr ob- obb obe obg obk obl obn obo obr oeb oee oeg oel oen oeo oer oge ogg ogl ogn ogo okb oke okg okk okl oko okr olb ole olg olk oll oln olo on- onb one ong onk onl onn ono onr oo- oob oog ook ool oon ooo oor or- orb ore org ork orl orn oro orr rbb rbe rbg rbk rbl rbn rbo rbr re- reb ree reg rek rel ren reo rer rgb rge rgg rgk rgn rgo rgr rkb rke rkg rkk rko rle rlg rll rln rlo rlr rnb rng rnn rno rnr rob roe rog rok rol ron roo ror rrb rrg rrk rrl rrn rrr