-er a-a a-c aaa aac aae aag aak aao aap aar aas ac- aca acc ace acg ack aco acp acr acs aea aec aee aeg aek aeo aep aer aes ag- aga agc age agg agk ago agp agr ags aka akc ake akg akk ako akp akr aks aoa aoc aoe aog aok aoo aop aor aos ap- apa apc ape apg apk apo app apr aps ar- ara arc are arg ark aro arp arr ars as- asa asc ase asg ask aso asp asr ass c-- caa cac cae cag cak cao cap car cas cca ccc cce ccg cck cco ccp ccr ccs ce- cea cec cee ceg cek ceo cep cer ces cga cgc cge cgg cgo cgp cgr cgs cka ckc cko cks co- coa coc coe cog cok coo cop cor cos cpa cpc cpe cpg cpk cpo cpp cpr cps cra crc cre crg crk cro crp crr crs csa csc cse csg csk cso csp csr css eaa eac eae eag eak eao eap ear eas ec- eca ecc ece ecg eck eco ecr ecs eea eec eee eeg eek eeo eep eer ees ega egc ege egg ego egp egr egs eka ekc eke ekg eko ekp ekr eks eo- eoa eoc eoe eog eok eoo eop eor eos ep- epa epc epe epg epo epp epr eps era erc ere erg erk ero erp err ers es- esa esc ese esg esk eso esp esr ess g-p gaa gac gae gag gak gao gap gar gas gca gcc gce gcg gck gco gcp gcr gcs ge- gea gec gee geg gek geo gep ger ges gga ggc ggg ggo ggp ggr ggs gka gko gkp gks goa goc goe gog gok goo gop gor gos gpa gpc gpe gpg gpk gpo gpp gpr gps gra grc gre grg grk gro grp grr grs gsa gsc gse gsg gsk gso gsp gsr gss ka- kaa kac kae kag kak kao kap kar kas kca kcc kce kcg kck kcp kcr kcs ke- kea kec kee keg kek keo kep ker kes kga kgc kgo kgp kgs kkc kke kkk kkp kkr kks koa koc koe kog kok koo kop kor kos kpa kpc kpe kpk kpo kpp kpr kps kra krc krg krk kro krp krr krs ksa ksc kse ksg ksk kso ksp ksr kss oaa oac oae oag oak oao oap oar oas oc- oca occ ocg ock oco ocp ocr ocs oea oec oee oeg oeo oep oer oes oga ogc oge ogg ogo ogp ogs oka okc oke okg okk oko okp okr oks oo- ooa ooc oog ook ooo oop oor oos op- opa opc ope opg opk opo opp opr ops or- ora orc ore org ork oro orp orr ors os- osa osc ose osg osk oso osp osr oss p-p paa pac pae pag pak pao pap par pas pca pcc pce pcg pck pco pcp pcr pcs pea pec pee peg pek peo pep per pes pga pgc pge pgg pgk pgo pgp pgr pgs pka pkc pke pkg pko pkp pkr pks poa poc poe pog pok poo pop por pos ppa ppc ppe ppg ppk ppo ppp ppr pps pra prc pre prg prk pro prp prr prs ps- psa psc pse psg psk pso psp psr pss ra- raa rac rae rag rak rao rap rar ras rca rcc rce rcg rco rcp rcr rcs re- rea rec ree reg rek reo rep rer res rga rgc rge rgg rgk rgo rgp rgr rgs rkc rke rkg rkk rko rkp rks roa roc roe rog rok roo rop ror ros rpa rpc rpe rpg rpk rpo rpp rpr rps rra rrc rrg rrk rrp rrr rrs rsa rsc rse rsg rsk rso rsp rsr rss saa sac sae sag sak sao sap sar sas sca scc sce scg sck sco scp scr scs se- sea sec see seg sek seo sep ser ses sga sgc sge sgg sgk sgo sgp sgr sgs sk- ska skc ske skg skk sko skp skr sks soa soc soe sog sok soo sop sor sos spa spc spe spg spk spo spp spr sps sr- sra src sre srg srk sro srp srr srs ss- ssa ssc sse ssg ssk sso ssp ssr sss