-er a-a a-c aaa aac aae aag aao aar aas aav ac- aca acc ace acg aco acr acs acv aea aec aee aeg aeo aer aes aev ag- aga agc age agg ago agr ags agv aoa aoc aoe aog aoo aor aos aov ar- ara arc are arg aro arr ars arv as- asa asc ase asg aso asr ass asv av- ava avc ave avg avo avr avs c-- caa cac cae cag cao car cas cav cca ccc cce ccg cco ccr ccs ccv ce- cea cec cee ceg ceo cer ces cev cga cgc cge cgg cgo cgr cgs cgv co- coa coc coe cog coo cor cos cov cra crc cre crg cro crr crs crv csa csc cse csg cso csr css csv cva cvc cve cvg cvo cvr cvs cvv eaa eac eae eag eao ear eas eav ec- eca ecc ece ecg eco ecr ecs ecv eea eec eee eeg eeo eer ees eev ega egc ege egg ego egr egs eo- eoa eoc eoe eog eoo eor eos era erc ere erg ero err ers erv es- esa esc ese esg eso esr ess esv eva evc eve evg evo evr evs evv gaa gac gae gag gao gar gas gav gca gcc gce gcg gco gcr gcs ge- gea gec gee geg geo ger ges gev gga ggc ggg ggo ggr ggs ggv goa goc goe gog goo gor gos gov gra grc gre grg gro grr grs grv gsa gsc gse gsg gso gsr gss gsv gva gvc gve gvg gvo gvr gvs oaa oac oae oag oao oar oas oav oc- oca occ ocg oco ocr ocs ocv oea oec oee oeg oeo oer oes oga ogc oge ogg ogo ogs oo- ooa ooc oog ooo oor oos oov or- ora orc ore org oro orr ors orv os- osa osc ose osg oso osr oss osv ov- ova ovc ove ovo ovs ovv ra- raa rac rae rag rao rar ras rav rca rcc rce rcg rco rcr rcs rcv re- rea rec ree reg reo rer res rev rga rgc rge rgg rgo rgr rgs rgv roa roc roe rog roo ror ros rov rra rrc rrg rrr rrs rsa rsc rse rsg rso rsr rss rsv rva rvc rve rvg rvo rvr rvs rvv saa sac sae sag sao sar sas sav sca scc sce scg sco scr scs scv se- sea sec see seg seo ser ses sev sga sgc sge sgg sgo sgr sgs sgv soa soc soe sog soo sor sos sov sr- sra src sre srg sro srr srs srv ss- ssa ssc sse ssg sso ssr sss ssv sva svc sve svg svo svr svs svv v-a v-e vaa vac vae vag vao var vas vav vca vcc vce vco vcr vcs vea vec vee veg veo ver ves vga vgc vgg vgo vgr vgs voa voc voe vog voo vor vos vov vra vrc vre vrg vrr vrs vsa vsc vse vsg vso vsr vss vsv vva vvc vvg vvo vvr vvs vvv