-er a-a a-c aaa aac aae aag aao aar aav ac- aca acc ace acg aco acr acv aea aec aee aeg aeo aer aev ag- aga agc age agg ago agr agv aoa aoc aoe aog aoo aor aov ar- ara arc are arg aro arr arv av- ava avc ave avg avo avr c-- caa cac cae cag cao car cav cca ccc cce ccg cco ccr ccv ce- cea cec cee ceg ceo cer cev cga cgc cge cgg cgo cgr cgv co- coa coc coe cog coo cor cov cra crc cre crg cro crr crv cva cvc cve cvg cvo cvr cvv eaa eac eae eag eao ear eav ec- eca ecc ece ecg eco ecr ecv eea eec eee eeg eeo eer eev ega egc ege egg ego egr eo- eoa eoc eoe eog eoo eor era erc ere erg ero err erv eva evc eve evg evo evr evv gaa gac gae gag gao gar gav gca gcc gce gcg gco gcr ge- gea gec gee geg geo ger gev gga ggc ggg ggo ggr ggv goa goc goe gog goo gor gov gra grc gre grg gro grr grv gva gvc gve gvg gvo gvr oaa oac oae oag oao oar oav oc- oca occ ocg oco ocr ocv oea oec oee oeg oeo oer oga ogc oge ogg ogo oo- ooa ooc oog ooo oor oov or- ora orc ore org oro orr orv ov- ova ovc ove ovo ovv ra- raa rac rae rag rao rar rav rca rcc rce rcg rco rcr rcv re- rea rec ree reg reo rer rev rga rgc rge rgg rgo rgr rgv roa roc roe rog roo ror rov rra rrc rrg rrr rva rvc rve rvg rvo rvr rvv v-a v-e vaa vac vae vag vao var vav vca vcc vce vco vcr vea vec vee veg veo ver vga vgc vgg vgo vgr voa voc voe vog voo vor vov vra vrc vre vrg vrr vva vvc vvg vvo vvr vvv