-er a-a a-c aaa aac aae aag aak aar aas aau ac- aca acc ace acg ack acr acs acu aea aec aee aeg aek aer aes aeu ag- aga agc age agg agk agr ags agu aka akc ake akg akk akr aks aku ar- ara arc are arg ark arr ars aru as- asa asc ase asg ask asr ass asu au- aua auc aue aug auk aur aus c-- caa cac cae cag cak car cas cau cca ccc cce ccg cck ccr ccs ccu ce- cea cec cee ceg cek cer ces ceu cga cgc cge cgg cgr cgs cgu cka ckc cks cra crc cre crg crk crr crs cru csa csc cse csg csk csr css csu cua cuc cue cug cuk cur cus cuu eaa eac eae eag eak ear eas eau ec- eca ecc ece ecg eck ecr ecs ecu eea eec eee eeg eek eer ees ega egc ege egg egr egs egu eka ekc eke ekg ekr eks eku era erc ere erg erk err ers eru es- esa esc ese esg esk esr ess esu eu- eua euc eue eug eur eus gaa gac gae gag gak gar gas gau gca gcc gce gcg gck gcr gcs gcu ge- gea gec gee geg gek ger ges geu gga ggc ggg ggr ggs ggu gka gks gra grc gre grg grk grr grs gru gsa gsc gse gsg gsk gsr gss gsu gu- gua guc gue gug guk gur gus guu ka- kaa kac kae kag kak kar kas kau kca kcc kce kcg kck kcr kcs kcu ke- kea kec kee keg kek ker kes kga kgc kgs kgu kkc kke kkk kkr kks kku kra krc krg krk krr krs kru ksa ksc kse ksg ksk ksr kss ksu kuc kue kug kuk kur kus kuu ra- raa rac rae rag rak rar ras rau rca rcc rce rcg rcr rcs rcu re- rea rec ree reg rek rer res reu rga rgc rge rgg rgk rgr rgs rkc rke rkg rkk rks rku rra rrc rrg rrk rrr rrs rru rsa rsc rse rsg rsk rsr rss rsu rua ruc rue rug ruk rur rus ruu saa sac sae sag sak sar sas sau sca scc sce scg sck scr scs scu se- sea sec see seg sek ser ses seu sga sgc sge sgg sgk sgr sgs sgu sk- ska skc ske skg skk skr sks sku sr- sra src sre srg srk srr srs ss- ssa ssc sse ssg ssk ssr sss ssu sua suc sue sug suk sur sus suu ua- uaa uac uae uag uak uar uas uau uca ucc uce ucg uck ucr ucs ucu uea uec uee ueg uer ues uga ugc uge ugg ugk ugr ugs ugu uka ukc uke ukk ukr uku ur- ura urc ure urg urk urr urs uru usa usc use usg usk usr uss usu uua uuc uue uug uur uus uuu