-er b-p bbb bbe bbg bbp bbr bbs bbt be- beb bee beg bep ber bes bet bgb bge bgg bgp bgr bgs bgt bpb bpe bpg bpp bpr bps bpt brb bre brg brp brr brs brt bsb bse bsg bsp bsr bss bst btb bte btg btp btr bts btt ebb ebe ebg ebp ebr ebs ebt eeb eee eeg eep eer ees eet egb ege egg egp egr egs egt ep- epb epe epg epp epr eps ept erb ere erg erp err ers ert es- esb ese esg esp esr ess est etb ete etg etp etr ets ett g-p gbe gbg gbp gbr gbs gbt ge- geb gee geg gep ger ges get ggb ggg ggp ggr ggs ggt gpb gpe gpg gpp gpr gps gpt grb gre grg grp grr grs grt gsb gse gsg gsp gsr gss gst gtb gte gtg gtp gtr gts gtt p-p pbb pbe pbg pbp pbr pbs pbt peb pee peg pep per pes pet pgb pge pgg pgp pgr pgs pgt ppb ppe ppg ppp ppr pps ppt prb pre prg prp prr prs prt ps- psb pse psg psp psr pss pst pt- ptb pte ptg ptp ptr pts ptt rbb rbe rbg rbp rbr rbs rbt re- reb ree reg rep rer res ret rgb rge rgg rgp rgr rgs rgt rpb rpe rpg rpp rpr rps rpt rrb rrg rrp rrr rrs rrt rsb rse rsg rsp rsr rss rst rtb rte rtg rtp rtr rts rtt sbb sbe sbg sbp sbr sbs sbt se- seb see seg sep ser ses set sgb sge sgg sgp sgr sgs sgt spb spe spg spp spr sps spt sr- srb sre srg srp srr srs srt ss- ssb sse ssg ssp ssr sss sst stb ste stg stp str sts stt tbb tbe tbg tbp tbr tbs tbt te- teb tee teg tep ter tes tet tgb tge tgg tgp tgr tgs tgt tpb tpe tpg tpp tpr tps tpt trb tre trg trp trr trs trt tsb tse tsg tsp tsr tss tst ttb tte ttg ttp ttr tts ttt