-er a-a a-b a-c a-t aaa aab aac aae aag aao aap aar aas aat ab- aba abb abc abe abg abo abp abr abs abt ac- aca acb acc ace acg aco acp acr acs act aea aeb aec aee aeg aeo aep aer aes aet ag- aga agb agc age agg ago agp agr ags agt aoa aob aoc aoe aog aoo aop aor aos aot ap- apa apb apc ape apg apo app apr aps apt ar- ara arb arc are arg aro arp arr ars art as- asa asb asc ase asg aso asp asr ass ast at- ata atb atc ate atg ato atp atr ats att b-p baa bab bac bae bag bao bap bar bas bat bba bbb bbc bbe bbg bbo bbp bbr bbs bbt bca bcb bcc bce bcg bco bcp bcr bcs bct be- bea beb bec bee beg beo bep ber bes bet bga bgb bgc bge bgg bgo bgp bgr bgs bgt boa bob boc boe bog boo bop bor bos bot bpa bpb bpc bpe bpg bpo bpp bpr bps bpt bra brb bre brg bro brp brr brs brt bsa bsb bsc bse bsg bso bsp bsr bss bst bta btb btc bte btg bto btp btr bts btt c-- caa cab cac cae cag cao cap car cas cat cba cbb cbc cbe cbg cbo cbp cbr cbs cbt cca ccb ccc cce ccg cco ccp ccr ccs cct ce- cea ceb cec cee ceg ceo cep cer ces cet cga cgb cgc cge cgg cgo cgp cgr cgs cgt co- coa cob coc coe cog coo cop cor cos cot cpa cpb cpc cpe cpg cpo cpp cpr cps cpt cra crb crc cre crg cro crp crr crs crt csa csb csc cse csg cso csp csr css cst cta ctb ctc cte ctg cto ctp ctr cts ctt eaa eab eac eae eag eao eap ear eas eat eba ebb ebc ebe ebg ebo ebp ebr ebs ebt ec- eca ecb ecc ece ecg eco ecr ecs ect eea eeb eec eee eeg eeo eep eer ees eet ega egb egc ege egg ego egp egr egs egt eo- eoa eob eoc eoe eog eoo eop eor eos eot ep- epa epb epc epe epg epo epp epr eps ept era erb erc ere erg ero erp err ers ert es- esa esb esc ese esg eso esp esr ess est eta etb etc ete etg eto etp etr ets ett g-p gaa gab gac gae gag gao gap gar gas gat gba gbc gbe gbg gbo gbp gbr gbs gbt gca gcb gcc gce gcg gco gcp gcr gcs gct ge- gea geb gec gee geg geo gep ger ges get gga ggb ggc ggg ggo ggp ggr ggs ggt goa gob goc goe gog goo gop gor gos got gpa gpb gpc gpe gpg gpo gpp gpr gps gpt gra grb grc gre grg gro grp grr grs grt gsa gsb gsc gse gsg gso gsp gsr gss gst gta gtb gtc gte gtg gto gtp gtr gts gtt oaa oab oac oae oag oao oap oar oas oat ob- oba obb obc obe obg obo obp obr obs obt oc- oca ocb occ ocg oco ocp ocr ocs oct oea oeb oec oee oeg oeo oep oer oes oet oga ogc oge ogg ogo ogp ogs ogt oo- ooa oob ooc oog ooo oop oor oos oot op- opa opb opc ope opg opo opp opr ops opt or- ora orb orc ore org oro orp orr ors ort os- osa osb osc ose osg oso osp osr oss ost ot- ota otb otc ote otg oto otp otr ots ott p-p paa pab pac pae pag pao pap par pas pat pba pbb pbc pbe pbg pbo pbp pbr pbs pbt pca pcb pcc pce pcg pco pcp pcr pcs pct pea peb pec pee peg peo pep per pes pet pga pgb pgc pge pgg pgo pgp pgr pgs pgt poa pob poc poe pog poo pop por pos pot ppa ppb ppc ppe ppg ppo ppp ppr pps ppt pra prb prc pre prg pro prp prr prs prt ps- psa psb psc pse psg pso psp psr pss pst pt- pta ptb ptc pte ptg pto ptp ptr pts ptt ra- raa rab rac rae rag rao rap rar ras rat rba rbb rbc rbe rbg rbo rbp rbr rbs rbt rca rcb rcc rce rcg rco rcp rcr rcs rct re- rea reb rec ree reg reo rep rer res ret rga rgb rgc rge rgg rgo rgp rgr rgs rgt roa rob roc roe rog roo rop ror ros rot rpa rpb rpc rpe rpg rpo rpp rpr rps rpt rra rrb rrc rrg rrp rrr rrs rrt rsa rsb rsc rse rsg rso rsp rsr rss rst rta rtb rtc rte rtg rto rtp rtr rts rtt saa sab sac sae sag sao sap sar sas sat sba sbb sbc sbe sbg sbo sbp sbr sbs sbt sca scb scc sce scg sco scp scr scs sct se- sea seb sec see seg seo sep ser ses set sga sgb sgc sge sgg sgo sgp sgr sgs sgt soa sob soc soe sog soo sop sor sos sot spa spb spc spe spg spo spp spr sps spt sr- sra srb src sre srg sro srp srr srs srt ss- ssa ssb ssc sse ssg sso ssp ssr sss sst sta stb stc ste stg sto stp str sts stt taa tab tac tae tag tao tap tar tas tat tba tbb tbc tbe tbg tbo tbp tbr tbs tbt tca tcb tcc tce tcg tco tcp tcr tcs tct te- tea teb tec tee teg teo tep ter tes tet tga tgb tgc tge tgg tgo tgp tgr tgs tgt to- toa tob toc toe tog too top tor tos tot tpa tpb tpc tpe tpg tpo tpp tpr tps tpt