-er a-a a-c aaa aac aae aak aar aas aav ac- aca acc ace ack acr acs acv aea aec aee aek aer aes aev aka akc ake akk akr aks akv ar- ara arc are ark arr ars arv as- asa asc ase ask asr ass asv av- ava avc ave avk avr avs c-- caa cac cae cak car cas cav cca ccc cce cck ccr ccs ccv ce- cea cec cee cek cer ces cev cka ckc cks cra crc cre crk crr crs crv csa csc cse csk csr css csv cva cvc cve cvk cvr cvs cvv eaa eac eae eak ear eas eav ec- eca ecc ece eck ecr ecs ecv eea eec eee eek eer ees eev eka ekc eke ekr eks ekv era erc ere erk err ers erv es- esa esc ese esk esr ess esv eva evc eve evr evs evv ka- kaa kac kae kak kar kas kav kca kcc kce kck kcr kcs ke- kea kec kee kek ker kes kev kkc kke kkk kkr kks kkv kra krc krk krr krs krv ksa ksc kse ksk ksr kss ksv kva kvk kvr kvs kvv ra- raa rac rae rak rar ras rav rca rcc rce rcr rcs rcv re- rea rec ree rek rer res rev rkc rke rkk rks rkv rra rrc rrk rrr rrs rsa rsc rse rsk rsr rss rsv rva rvc rve rvr rvs rvv saa sac sae sak sar sas sav sca scc sce sck scr scs scv se- sea sec see sek ser ses sev sk- ska skc ske skk skr sks sr- sra src sre srk srr srs srv ss- ssa ssc sse ssk ssr sss ssv sva svc sve svk svr svs svv v-a v-e vaa vac vae vak var vas vav vca vcc vce vcr vcs vea vec vee vek ver ves vka vra vrc vre vrk vrr vrs vsa vsc vse vsk vsr vss vsv vva vvc vvr vvs vvv