-er bbb bbe bbg bbl bbr bbs bbt be- beb bee beg bel ber bes bet bgb bge bgg bgl bgr bgs bgt blb ble blg bll blr bls blt brb bre brg brl brr brs brt bsb bse bsg bsl bsr bss bst btb bte btg btl btr bts btt ebb ebe ebg ebl ebr ebs ebt eeb eee eeg eel eer ees eet egb ege egg egl egr egs egt elb ele elg ell elr els elt erb ere erg erl err ers ert es- esb ese esg esl esr ess est etb ete etg etl etr ets ett gbe gbg gbl gbr gbs gbt ge- geb gee geg gel ger ges get ggb ggg ggr ggs ggt glb gle glg gll glr gls glt grb gre grg grl grr grs grt gsb gse gsg gsl gsr gss gst gtb gte gtg gtl gtr gts gtt lbb lbe lbg lbl lbr lbs lbt leb lee leg lel ler les let lgb lge lgg lgl lgr lgs lgt llb lle llg lll llr lls llt lrb lrg lrr lrs lrt lsb lse lsg lsl lsr lss lst ltb lte ltg ltl ltr lts ltt rbb rbe rbg rbl rbr rbs rbt re- reb ree reg rel rer res ret rgb rge rgg rgr rgs rgt rle rlg rll rlr rls rlt rrb rrg rrl rrr rrs rrt rsb rse rsg rsl rsr rss rst rtb rte rtg rtl rtr rts rtt sbb sbe sbg sbl sbr sbs sbt se- seb see seg sel ser ses set sgb sge sgg sgl sgr sgs sgt slb sle slg sll slr sls slt sr- srb sre srg srl srr srs srt ss- ssb sse ssg ssl ssr sss sst stb ste stg stl str sts stt tbb tbe tbg tbl tbr tbs tbt te- teb tee teg tel ter tes tet tgb tge tgg tgl tgr tgs tgt tle tlg tll tlr tls tlt trb tre trg trl trr trs trt tsb tse tsg tsl tsr tss tst ttb tte ttg ttl ttr tts ttt