-er a-a a-c aaa aac aae aag aar aas aav ac- aca acc ace acg acr acs acv aea aec aee aeg aer aes aev ag- aga agc age agg agr ags agv ar- ara arc are arg arr ars arv as- asa asc ase asg asr ass asv av- ava avc ave avg avr avs c-- caa cac cae cag car cas cav cca ccc cce ccg ccr ccs ccv ce- cea cec cee ceg cer ces cev cga cgc cge cgg cgr cgs cgv cra crc cre crg crr crs crv csa csc cse csg csr css csv cva cvc cve cvg cvr cvs cvv eaa eac eae eag ear eas eav ec- eca ecc ece ecg ecr ecs ecv eea eec eee eeg eer ees eev ega egc ege egg egr egs era erc ere erg err ers erv es- esa esc ese esg esr ess esv eva evc eve evg evr evs evv gaa gac gae gag gar gas gav gca gcc gce gcg gcr gcs ge- gea gec gee geg ger ges gev gga ggc ggg ggr ggs ggv gra grc gre grg grr grs grv gsa gsc gse gsg gsr gss gsv gva gvc gve gvg gvr gvs ra- raa rac rae rag rar ras rav rca rcc rce rcg rcr rcs rcv re- rea rec ree reg rer res rev rga rgc rge rgg rgr rgs rgv rra rrc rrg rrr rrs rsa rsc rse rsg rsr rss rsv rva rvc rve rvg rvr rvs rvv saa sac sae sag sar sas sav sca scc sce scg scr scs scv se- sea sec see seg ser ses sev sga sgc sge sgg sgr sgs sgv sr- sra src sre srg srr srs srv ss- ssa ssc sse ssg ssr sss ssv sva svc sve svg svr svs svv v-a v-e vaa vac vae vag var vas vav vca vcc vce vcr vcs vea vec vee veg ver ves vga vgc vgg vgr vgs vra vrc vre vrg vrr vrs vsa vsc vse vsg vsr vss vsv vva vvc vvg vvr vvs vvv