-er bbb bbe bbg bbr bbs bbt be- beb bee beg ber bes bet bgb bge bgg bgr bgs bgt brb bre brg brr brs brt bsb bse bsg bsr bss bst btb bte btg btr bts btt ebb ebe ebg ebr ebs ebt eeb eee eeg eer ees eet egb ege egg egr egs egt erb ere erg err ers ert es- esb ese esg esr ess est etb ete etg etr ets ett gbe gbg gbr gbs gbt ge- geb gee geg ger ges get ggb ggg ggr ggs ggt grb gre grg grr grs grt gsb gse gsg gsr gss gst gtb gte gtg gtr gts gtt rbb rbe rbg rbr rbs rbt re- reb ree reg rer res ret rgb rge rgg rgr rgs rgt rrb rrg rrr rrs rrt rsb rse rsg rsr rss rst rtb rte rtg rtr rts rtt sbb sbe sbg sbr sbs sbt se- seb see seg ser ses set sgb sge sgg sgr sgs sgt sr- srb sre srg srr srs srt ss- ssb sse ssg ssr sss sst stb ste stg str sts stt tbb tbe tbg tbr tbs tbt te- teb tee teg ter tes tet tgb tge tgg tgr tgs tgt trb tre trg trr trs trt tsb tse tsg tsr tss tst ttb tte ttg ttr tts ttt