-er a-a a-b a-t aaa aab aae aag aap aar aas aat ab- aba abb abe abg abp abr abs abt aea aeb aee aeg aep aer aes aet ag- aga agb age agg agp agr ags agt ap- apa apb ape apg app apr aps apt ar- ara arb are arg arp arr ars art as- asa asb ase asg asp asr ass ast at- ata atb ate atg atp atr ats att b-p baa bab bae bag bap bar bas bat bba bbb bbe bbg bbp bbr bbs bbt be- bea beb bee beg bep ber bes bet bga bgb bge bgg bgp bgr bgs bgt bpa bpb bpe bpg bpp bpr bps bpt bra brb bre brg brp brr brs brt bsa bsb bse bsg bsp bsr bss bst bta btb bte btg btp btr bts btt eaa eab eae eag eap ear eas eat eba ebb ebe ebg ebp ebr ebs ebt eea eeb eee eeg eep eer ees eet ega egb ege egg egp egr egs egt ep- epa epb epe epg epp epr eps ept era erb ere erg erp err ers ert es- esa esb ese esg esp esr ess est eta etb ete etg etp etr ets ett g-p gaa gab gae gag gap gar gas gat gba gbe gbg gbp gbr gbs gbt ge- gea geb gee geg gep ger ges get gga ggb ggg ggp ggr ggs ggt gpa gpb gpe gpg gpp gpr gps gpt gra grb gre grg grp grr grs grt gsa gsb gse gsg gsp gsr gss gst gta gtb gte gtg gtp gtr gts gtt p-p paa pab pae pag pap par pas pat pba pbb pbe pbg pbp pbr pbs pbt pea peb pee peg pep per pes pet pga pgb pge pgg pgp pgr pgs pgt ppa ppb ppe ppg ppp ppr pps ppt pra prb pre prg prp prr prs prt ps- psa psb pse psg psp psr pss pst pt- pta ptb pte ptg ptp ptr pts ptt ra- raa rab rae rag rap rar ras rat rba rbb rbe rbg rbp rbr rbs rbt re- rea reb ree reg rep rer res ret rga rgb rge rgg rgp rgr rgs rgt rpa rpb rpe rpg rpp rpr rps rpt rra rrb rrg rrp rrr rrs rrt rsa rsb rse rsg rsp rsr rss rst rta rtb rte rtg rtp rtr rts rtt saa sab sae sag sap sar sas sat sba sbb sbe sbg sbp sbr sbs sbt se- sea seb see seg sep ser ses set sga sgb sge sgg sgp sgr sgs sgt spa spb spe spg spp spr sps spt sr- sra srb sre srg srp srr srs srt ss- ssa ssb sse ssg ssp ssr sss sst sta stb ste stg stp str sts stt taa tab tae tag tap tar tas tat tba tbb tbe tbg tbp tbr tbs tbt te- tea teb tee teg tep ter tes tet tga tgb tge tgg tgp tgr tgs tgt tpa tpb tpe tpg tpp tpr tps tpt tra trb tre trg trp trr trs trt tsa tsb tse tsg tsp tsr tss tst tta ttb tte ttg ttp ttr tts ttt