-er a-a a-b a-c a-t aaa aab aac aae aag aap aar aas aat ab- aba abb abc abe abg abp abr abs abt ac- aca acb acc ace acg acp acr acs act aea aeb aec aee aeg aep aer aes aet ag- aga agb agc age agg agp agr ags agt ap- apa apb apc ape apg app apr aps apt ar- ara arb arc are arg arp arr ars art as- asa asb asc ase asg asp asr ass ast at- ata atb atc ate atg atp atr ats att b-p baa bab bac bae bag bap bar bas bat bba bbb bbc bbe bbg bbp bbr bbs bbt bca bcb bcc bce bcg bcp bcr bcs bct be- bea beb bec bee beg bep ber bes bet bga bgb bgc bge bgg bgp bgr bgs bgt bpa bpb bpc bpe bpg bpp bpr bps bpt bra brb bre brg brp brr brs brt bsa bsb bsc bse bsg bsp bsr bss bst bta btb btc bte btg btp btr bts btt c-- caa cab cac cae cag cap car cas cat cba cbb cbc cbe cbg cbp cbr cbs cbt cca ccb ccc cce ccg ccp ccr ccs cct ce- cea ceb cec cee ceg cep cer ces cet cga cgb cgc cge cgg cgp cgr cgs cgt cpa cpb cpc cpe cpg cpp cpr cps cpt cra crb crc cre crg crp crr crs crt csa csb csc cse csg csp csr css cst cta ctb ctc cte ctg ctp ctr cts ctt eaa eab eac eae eag eap ear eas eat eba ebb ebc ebe ebg ebp ebr ebs ebt ec- eca ecb ecc ece ecg ecr ecs ect eea eeb eec eee eeg eep eer ees eet ega egb egc ege egg egp egr egs egt ep- epa epb epc epe epg epp epr eps ept era erb erc ere erg erp err ers ert es- esa esb esc ese esg esp esr ess est eta etb etc ete etg etp etr ets ett g-p gaa gab gac gae gag gap gar gas gat gba gbc gbe gbg gbp gbr gbs gbt gca gcb gcc gce gcg gcp gcr gcs gct ge- gea geb gec gee geg gep ger ges get gga ggb ggc ggg ggp ggr ggs ggt gpa gpb gpc gpe gpg gpp gpr gps gpt gra grb grc gre grg grp grr grs grt gsa gsb gsc gse gsg gsp gsr gss gst gta gtb gtc gte gtg gtp gtr gts gtt p-p paa pab pac pae pag pap par pas pat pba pbb pbc pbe pbg pbp pbr pbs pbt pca pcb pcc pce pcg pcp pcr pcs pct pea peb pec pee peg pep per pes pet pga pgb pgc pge pgg pgp pgr pgs pgt ppa ppb ppc ppe ppg ppp ppr pps ppt pra prb prc pre prg prp prr prs prt ps- psa psb psc pse psg psp psr pss pst pt- pta ptb ptc pte ptg ptp ptr pts ptt ra- raa rab rac rae rag rap rar ras rat rba rbb rbc rbe rbg rbp rbr rbs rbt rca rcb rcc rce rcg rcp rcr rcs rct re- rea reb rec ree reg rep rer res ret rga rgb rgc rge rgg rgp rgr rgs rgt rpa rpb rpc rpe rpg rpp rpr rps rpt rra rrb rrc rrg rrp rrr rrs rrt rsa rsb rsc rse rsg rsp rsr rss rst rta rtb rtc rte rtg rtp rtr rts rtt saa sab sac sae sag sap sar sas sat sba sbb sbc sbe sbg sbp sbr sbs sbt sca scb scc sce scg scp scr scs sct se- sea seb sec see seg sep ser ses set sga sgb sgc sge sgg sgp sgr sgs sgt spa spb spc spe spg spp spr sps spt sr- sra srb src sre srg srp srr srs srt ss- ssa ssb ssc sse ssg ssp ssr sss sst sta stb stc ste stg stp str sts stt taa tab tac tae tag tap tar tas tat tba tbb tbc tbe tbg tbp tbr tbs tbt tca tcb tcc tce tcg tcp tcr tcs tct te- tea teb tec tee teg tep ter tes tet tga tgb tgc tge tgg tgp tgr tgs tgt tpa tpb tpc tpe tpg tpp tpr tps tpt tra trb trc tre trg trp trr trs trt tsa tsb tsc tse tsg tsp tsr tss tst tta ttb ttc tte ttg ttp ttr tts ttt