-er a-a a-c aaa aac aae aao aar aas aav ac- aca acc ace aco acr acs acv aea aec aee aeo aer aes aev aoa aoc aoe aoo aor aos aov ar- ara arc are aro arr ars arv as- asa asc ase aso asr ass asv av- ava avc ave avo avr avs c-- caa cac cae cao car cas cav cca ccc cce cco ccr ccs ccv ce- cea cec cee ceo cer ces cev co- coa coc coe coo cor cos cov cra crc cre cro crr crs crv csa csc cse cso csr css csv cva cvc cve cvo cvr cvs cvv eaa eac eae eao ear eas eav ec- eca ecc ece eco ecr ecs ecv eea eec eee eeo eer ees eev eo- eoa eoc eoe eoo eor eos era erc ere ero err ers erv es- esa esc ese eso esr ess esv eva evc eve evo evr evs evv oaa oac oae oao oar oas oav oc- oca occ oco ocr ocs ocv oea oec oee oeo oer oes oo- ooa ooc ooo oor oos oov or- ora orc ore oro orr ors orv os- osa osc ose oso osr oss osv ov- ova ovc ove ovo ovs ovv ra- raa rac rae rao rar ras rav rca rcc rce rco rcr rcs rcv re- rea rec ree reo rer res rev roa roc roe roo ror ros rov rra rrc rrr rrs rsa rsc rse rso rsr rss rsv rva rvc rve rvo rvr rvs rvv saa sac sae sao sar sas sav sca scc sce sco scr scs scv se- sea sec see seo ser ses sev soa soc soe soo sor sos sov sr- sra src sre sro srr srs srv ss- ssa ssc sse sso ssr sss ssv sva svc sve svo svr svs svv v-a v-e vaa vac vae vao var vas vav vca vcc vce vco vcr vcs vea vec vee veo ver ves voa voc voe voo vor vos vov vra vrc vre vrr vrs vsa vsc vse vso vsr vss vsv vva vvc vvo vvr vvs vvv