-er a-a a-c aaa aac aae aag aaj aak aan aar aas ac- aca acc ace acg acj ack acn acr acs aea aec aee aeg aej aek aen aer aes ag- aga agc age agg agj agk agn agr ags aja ajc aje ajj ajk ajn ajr ajs aka akc ake akg akj akk akn akr aks an- ana anc ane ang anj ank ann anr ans ar- ara arc are arg arj ark arn arr ars as- asa asc ase asg asj ask asn asr ass c-- c-j caa cac cae cag caj cak can car cas cca ccc cce ccg ccj cck ccn ccr ccs ce- cea cec cee ceg cej cek cen cer ces cga cgc cge cgg cgn cgr cgs cja cjc cjg cjk cjr cjs cka ckc cks cn- cna cnc cne cng cnj cnn cnr cns cra crc cre crg crj crk crn crr crs csa csc cse csg csj csk csn csr css eaa eac eae eag eaj eak ean ear eas ec- eca ecc ece ecg ecj eck ecn ecr ecs eea eec eee eeg eek een eer ees ega egc ege egg egn egr egs eja ejc eka ekc eke ekg ekr eks en- ena enc ene eng enk enn enr ens era erc ere erg erk ern err ers es- esa esc ese esg esk esn esr ess gaa gac gae gag gaj gak gan gar gas gca gcc gce gcg gck gcn gcr gcs ge- gea gec gee geg gek gen ger ges gga ggc ggg ggj ggn ggr ggs gja gjc gje gjg gjr gka gkn gks gna gnc gne gnn gnr gns gra grc gre grg grj grk grn grr grs gsa gsc gse gsg gsj gsk gsn gsr gss jaa jac jae jag jaj jak jan jar jas jca jcc jce jck jcr jcs jea jec jee jeg jej jek jen jer jes jga jge jgn jgr jgs jja jjc jjg jjj jjk jjr jjs jka jkk jkn jkr jks jna jnc jne jng jnj jnn jnr jns jra jrc jrg jrk jrn jrr jrs jsa jsc jse jsg jsj jsk jsn jsr jss ka- kaa kac kae kag kaj kak kan kar kas kca kcc kce kcg kck kcn kcr kcs ke- kea kec kee keg kek ken ker kes kga kgc kgs kjc kje kjr kjs kkc kke kkk kkn kkr kks kn- kna knc kne kng knk knn knr kra krc krg krk krn krr krs ksa ksc kse ksg ksk ksn ksr kss naa nac nae nag naj nak nan nar nas nca ncc nce ncg nck ncn ncr ncs ne- nea nec nee neg nej nek nen ner nes nga ngc nge ngg ngj ngk ngn ngs nja njc nje njk njn njs nka nkc nke nkj nkk nkn nkr nks nna nnc nne nng nnk nnn nns nra nrc nre nrg nrj nrk nrn nrr nrs nsa nsc nse nsg nsk nsn nsr nss ra- raa rac rae rag raj rak ran rar ras rca rcc rce rcg rcj rcn rcr rcs re- rea rec ree reg rek ren rer res rga rgc rge rgg rgk rgn rgr rgs rja rjc rjg rjk rjr rkc rke rkg rkk rks rna rnc rng rnn rnr rns rra rrc rrg rrk rrn rrr rrs rsa rsc rse rsg rsj rsk rsn rsr rss saa sac sae sag saj sak san sar sas sca scc sce scg scj sck scn scr scs se- sea sec see seg sej sek sen ser ses sga sgc sge sgg sgk sgn sgr sgs sja sjc sje sjj sjk sjr sjs sk- ska skc ske skg skj skk skr sks sna snc sne sng snj snk snn snr sns sr- sra src sre srg srj srk srn srr srs ss- ssa ssc sse ssg ssj ssk ssn ssr sss