-er bbb bbe bbg bbk bbl bbr bbs be- beb bee beg bek bel ber bes bgb bge bgg bgk bgl bgr bgs bkb bke bkg bkk bkl bkr bks blb ble blg blk bll blr bls brb bre brg brk brl brr brs bsb bse bsg bsk bsl bsr bss ebb ebe ebg ebk ebl ebr ebs eeb eee eeg eek eel eer ees egb ege egg egl egr egs ekb eke ekg ekl ekr eks elb ele elg elk ell elr els erb ere erg erk erl err ers es- esb ese esg esk esl esr ess gbe gbg gbk gbl gbr gbs ge- geb gee geg gek gel ger ges ggb ggg ggr ggs gkb gks glb gle glg glk gll glr gls grb gre grg grk grl grr grs gsb gse gsg gsk gsl gsr gss kbb kbe kbk kbl kbr kbs ke- keb kee keg kek kel ker kes kgb kgl kgs kkb kke kkk kkl kkr kks kl- klb klg klr kls krg krk krl krr krs ksb kse ksg ksk ksl ksr kss lbb lbe lbg lbk lbl lbr lbs leb lee leg lek lel ler les lgb lge lgg lgk lgl lgr lgs lkb lkg lkl lkr lks llb lle llg llk lll llr lls lrb lrg lrk lrr lrs lsb lse lsg lsk lsl lsr lss rbb rbe rbg rbk rbl rbr rbs re- reb ree reg rek rel rer res rgb rge rgg rgk rgr rgs rkb rke rkg rkk rks rle rlg rll rlr rls rrb rrg rrk rrl rrr rrs rsb rse rsg rsk rsl rsr rss sbb sbe sbg sbk sbl sbr sbs se- seb see seg sek sel ser ses sgb sge sgg sgk sgl sgr sgs sk- skb ske skg skk skl skr sks slb sle slg slk sll slr sls sr- srb sre srg srk srl srr srs ss- ssb sse ssg ssk ssl ssr sss