-er -ol bbb bbe bbg bbk bbl bbn bbo bbr bbs be- beb bee beg bek bel ben beo ber bes bgb bge bgg bgk bgl bgn bgo bgr bgs bkb bke bkg bkk bkl bkn bko bkr bks blb ble blg blk bll bln blo blr bls bnb bne bng bnk bnl bnn bno bnr bns bob boe bog bok bol bon boo bor bos brb bre brg brk brl brn bro brr brs bsb bse bsg bsk bsl bsn bso bsr bss ebb ebe ebg ebk ebl ebn ebo ebr ebs eeb eee eeg eek eel een eeo eer ees egb ege egg egl egn ego egr egs ekb eke ekg ekl eko ekr eks elb ele elg elk ell eln elo elr els en- enb ene eng enk enl enn eno enr ens eo- eob eoe eog eok eol eon eoo eor eos erb ere erg erk erl ern ero err ers es- esb ese esg esk esl esn eso esr ess gbe gbg gbk gbl gbn gbo gbr gbs ge- geb gee geg gek gel gen geo ger ges ggb ggg ggn ggo ggr ggs gkb gkn gko gks glb gle glg glk gll gln glo glr gls gnb gne gnl gnn gno gnr gns gob goe gog gok gol gon goo gor gos grb gre grg grk grl grn gro grr grs gsb gse gsg gsk gsl gsn gso gsr gss kbb kbe kbk kbl kbn kbo kbr kbs ke- keb kee keg kek kel ken keo ker kes kgb kgl kgo kgs kkb kke kkk kkl kkn kkr kks kl- klb klg klo klr kls kn- kne kng knk knl knn kno knr kob koe kog kok kol kon koo kor kos krg krk krl krn kro krr krs ksb kse ksg ksk ksl ksn kso ksr kss lbb lbe lbg lbk lbl lbo lbr lbs leb lee leg lek lel len leo ler les lgb lge lgg lgk lgl lgn lgo lgr lgs lkb lkg lkl lkr lks llb lle llg llk lll lln llo llr lls lnb lne lng lnk lnl lnn lno lnr lns lob loe log lok lol lon loo lor los lrb lrg lrk lrn lro lrr lrs lsb lse lsg lsk lsl lsn lso lsr lss nbb nbe nbg nbk nbl nbn nbo nbr nbs ne- neb nee neg nek nel nen neo ner nes ngb nge ngg ngk ngl ngn ngo ngs nke nkk nkn nko nkr nks nlb nle nlg nlk nll nln nlo nlr nls nnb nne nng nnk nnl nnn nno nns no- nob noe nog nok nol non noo nor nos nrb nre nrg nrk nrl nrn nro nrr nrs nsb nse nsg nsk nsl nsn nso nsr nss ob- obb obe obg obk obl obn obo obr obs oeb oee oeg oel oen oeo oer oes oge ogg ogl ogn ogo ogs okb oke okg okk okl oko okr oks olb ole olg olk oll oln olo ols on- onb one ong onk onl onn ono onr ons oo- oob oog ook ool oon ooo oor oos or- orb ore org ork orl orn oro orr ors os- osb ose osg osk osl osn oso osr oss rbb rbe rbg rbk rbl rbn rbo rbr rbs re- reb ree reg rek rel ren reo rer res rgb rge rgg rgk rgn rgo rgr rgs rkb rke rkg rkk rko rks rle rlg rll rln rlo rlr rls rnb rng rnn rno rnr rns rob roe rog rok rol ron roo ror ros rrb rrg rrk rrl rrn rrr rrs rsb rse rsg rsk rsl rsn rso rsr rss sbb sbe sbg sbk sbl sbn sbo sbr sbs se- seb see seg sek sel sen seo ser ses sgb sge sgg sgk sgl sgn sgo sgr sgs sk- skb ske skg skk skl sko skr sks slb sle slg slk sll sln slo slr sls snb sne sng snk snl snn sno snr sns sob soe sog sok sol son soo sor sos sr- srb sre srg srk srl srn sro srr srs ss- ssb sse ssg ssk ssl ssn sso ssr sss