-er a-a a-c aaa aac aae aaj aak aar aas ac- aca acc ace acj ack acr acs aea aec aee aej aek aer aes aja ajc aje ajj ajk ajr ajs aka akc ake akj akk akr aks ar- ara arc are arj ark arr ars as- asa asc ase asj ask asr ass c-- c-j caa cac cae caj cak car cas cca ccc cce ccj cck ccr ccs ce- cea cec cee cej cek cer ces cja cjc cjk cjr cjs cka ckc cks cra crc cre crj crk crr crs csa csc cse csj csk csr css eaa eac eae eaj eak ear eas ec- eca ecc ece ecj eck ecr ecs eea eec eee eek eer ees eja ejc eka ekc eke ekr eks era erc ere erk err ers es- esa esc ese esk esr ess jaa jac jae jaj jak jar jas jca jcc jce jck jcr jcs jea jec jee jej jek jer jes jja jjc jjj jjk jjr jjs jka jkk jkr jks jra jrc jrk jrr jrs jsa jsc jse jsj jsk jsr jss ka- kaa kac kae kaj kak kar kas kca kcc kce kck kcr kcs ke- kea kec kee kek ker kes kjc kje kjr kjs kkc kke kkk kkr kks kra krc krk krr krs ksa ksc kse ksk ksr kss ra- raa rac rae raj rak rar ras rca rcc rce rcj rcr rcs re- rea rec ree rek rer res rja rjc rjk rjr rkc rke rkk rks rra rrc rrk rrr rrs rsa rsc rse rsj rsk rsr rss saa sac sae saj sak sar sas sca scc sce scj sck scr scs se- sea sec see sej sek ser ses sja sjc sje sjj sjk sjr sjs sk- ska skc ske skj skk skr sks sr- sra src sre srj srk srr srs ss- ssa ssc sse ssj ssk ssr sss