-er -ol bbb bbe bbg bbi bbk bbl bbo bbr bbs be- beb bee beg bei bek bel beo ber bes bgb bge bgg bgi bgk bgl bgo bgr bgs bi- bib bie big bii bik bil bio bir bis bkb bke bkg bkk bkl bko bkr bks blb ble blg bli blk bll blo blr bls bob boe bog boi bok bol boo bor bos brb bre brg bri brk brl bro brr brs bsb bse bsg bsi bsk bsl bso bsr bss ebb ebe ebg ebi ebk ebl ebo ebr ebs eeb eee eeg eek eel eeo eer ees egb ege egg egi egl ego egr egs eib eie eig eii eik eil eio eir eis ekb eke ekg eki ekl eko ekr eks elb ele elg eli elk ell elo elr els eo- eob eoe eog eoi eok eol eoo eor eos erb ere erg eri erk erl ero err ers es- esb ese esg esi esk esl eso esr ess gbe gbg gbi gbk gbl gbo gbr gbs ge- geb gee geg gei gek gel geo ger ges ggb ggg ggi ggo ggr ggs gib gie gig gii gik gil gio gir gis gkb gko gks glb gle glg gli glk gll glo glr gls gob goe gog goi gok gol goo gor gos grb gre grg gri grk grl gro grr grs gsb gse gsg gsi gsk gsl gso gsr gss ibb ibe ibg ibi ibk ibl ibo ibr ibs ie- iee ieg iei iek iel ier ies igb ige igg igi igk igl igo igr igs iib iie iii iil iio iir iis ikb ike iki ikk ikl iko ikr iks il- ilb ile ilg ili ilk ill ilo ilr ils io- iob ioe iog ioi iol ioo ior ios ir- irb ire irg iri irk irl iro irr irs is- isb ise isg isi isk isl iso isr iss kbb kbe kbi kbk kbl kbo kbr kbs ke- keb kee keg kei kek kel keo ker kes kgb kgi kgl kgo kgs kib kie kig kii kik kil kio kir kis kkb kke kki kkk kkl kkr kks kl- klb klg kli klo klr kls kob koe kog koi kok kol koo kor kos krg kri krk krl kro krr krs ksb kse ksg ksi ksk ksl kso ksr kss lbb lbe lbg lbi lbk lbl lbo lbr lbs leb lee leg lei lek lel leo ler les lgb lge lgg lgi lgk lgl lgo lgr lgs lib lie lig lii lik lil lio lir lis lkb lkg lkl lkr lks llb lle llg lli llk lll llo llr lls lob loe log loi lok lol loo lor los lrb lrg lri lrk lro lrr lrs lsb lse lsg lsi lsk lsl lso lsr lss o-i ob- obb obe obg obi obk obl obo obr obs oeb oee oeg oei oel oeo oer oes oge ogg ogi ogl ogo ogs oib oie oii oik oil oio oir ois okb oke okg oki okk okl oko okr oks olb ole olg oli olk oll olo ols oo- oob oog ooi ook ool ooo oor oos or- orb ore org ori ork orl oro orr ors os- osb ose osg osi osk osl oso osr oss rbb rbe rbg rbi rbk rbl rbo rbr rbs re- reb ree reg rei rek rel reo rer res rgb rge rgg rgi rgk rgo rgr rgs rib rie rig rii rik ril rio rir ris rkb rke rkg rkk rko rks rle rlg rli rll rlo rlr rls rob roe rog roi rok rol roo ror ros rrb rrg rri rrk rrl rrr rrs rsb rse rsg rsi rsk rsl rso rsr rss sbb sbe sbg sbi sbk sbl sbo sbr sbs se- seb see seg sei sek sel seo ser ses sgb sge sgg sgi sgk sgl sgo sgr sgs sib sie sig sii sik sil sio sir sis sk- skb ske skg ski skk skl sko skr sks slb sle slg sli slk sll slo slr sls sob soe sog soi sok sol soo sor sos sr- srb sre srg sri srk srl sro srr srs ss- ssb sse ssg ssi ssk ssl sso ssr sss