-er a-a a-c aaa aac aae aaf aaj aak aar aas ac- aca acc ace acf acj ack acr acs aea aec aee aef aej aek aer aes af- afa afc afe aff afj afk afr afs aja ajc aje ajf ajj ajk ajr ajs aka akc ake akj akk akr aks ar- ara arc are arf arj ark arr ars as- asa asc ase asf asj ask asr ass c-- c-j caa cac cae caf caj cak car cas cca ccc cce ccf ccj cck ccr ccs ce- cea cec cee cef cej cek cer ces cfa cfc cfe cff cfk cfr cfs cja cjc cjf cjk cjr cjs cka ckc cks cra crc cre crf crj crk crr crs csa csc cse csf csj csk csr css eaa eac eae eaf eaj eak ear eas ec- eca ecc ece ecf ecj eck ecr ecs eea eec eee eef eek eer ees ef- efa efc efe eff efr efs eja ejc ejf eka ekc eke ekf ekr eks era erc ere erf erk err ers es- esa esc ese esf esk esr ess faa fac fae faf faj fak far fas fca fcc fce fcf fcj fck fcr fcs fea fec fee fef fek fer fes ffa ffc ffe fff ffk ffr ffs fja fjc fjs fka fkc fkf fkj fkk fra frc fre frf frj frk frr frs fsa fsc fse fsf fsj fsk fsr fss jaa jac jae jaf jaj jak jar jas jca jcc jce jcf jck jcr jcs jea jec jee jef jej jek jer jes jfa jfc jfe jff jfj jfk jfr jfs jja jjc jjf jjj jjk jjr jjs jka jkk jkr jks jra jrc jrf jrk jrr jrs jsa jsc jse jsf jsj jsk jsr jss ka- kaa kac kae kaf kaj kak kar kas kca kcc kce kck kcr kcs ke- kea kec kee kef kek ker kes kfa kfc kff kfs kjc kje kjr kjs kkc kke kkk kkr kks kra krc krf krk krr krs ksa ksc kse ksf ksk ksr kss ra- raa rac rae raf raj rak rar ras rca rcc rce rcf rcj rcr rcs re- rea rec ree ref rek rer res rfa rfc rfe rff rfj rfk rfr rfs rja rjc rjf rjk rjr rkc rke rkf rkk rks rra rrc rrf rrk rrr rrs rsa rsc rse rsf rsj rsk rsr rss saa sac sae saf saj sak sar sas sca scc sce scf scj sck scr scs se- sea sec see sef sej sek ser ses sfa sfc sfe sff sfj sfk sfr sfs sja sjc sje sjf sjj sjk sjr sjs sk- ska skc ske skf skj skk skr sks sr- sra src sre srf srj srk srr srs ss- ssa ssc sse ssf ssj ssk ssr sss