-er a-a a-c aaa aac aad aae aag aao aar aav ac- aca acc acd ace acg aco acr acv ad- ada adc add ade adg ado adr adv aea aec aed aee aeg aeo aer aev ag- aga agc agd age agg ago agr agv aoa aoc aod aoe aog aoo aor aov ar- ara arc ard are arg aro arr arv av- ava avc avd ave avg avo avr c-- caa cac cad cae cag cao car cav cca ccc ccd cce ccg cco ccr ccv cda cdc cdd cde cdg cdo cdr cdv ce- cea cec ced cee ceg ceo cer cev cga cgc cgd cge cgg cgo cgr cgv co- coa coc cod coe cog coo cor cov cra crc crd cre crg cro crr crv cva cvc cvd cve cvg cvo cvr cvv daa dac dad dae dag dao dar dav dca dcc dcd dce dcg dco dcr dcv dda ddc ddd dde ddg ddo ddr de- dea dec ded dee deg deo der dev dga dgc dgd dge dgg dgr doa doc dod doe dog doo dor dov dra drc drd dre drg dro drr drv dva dvc dvd dve dvg dvr eaa eac ead eae eag eao ear eav ec- eca ecc ecd ece ecg eco ecr ecv ed- eda edc edd ede edg edo edr eea eec eed eee eeg eeo eer eev ega egc egd ege egg ego egr eo- eoa eoc eod eoe eog eoo eor era erc erd ere erg ero err erv eva evc evd eve evg evo evr evv g-d gaa gac gad gae gag gao gar gav gca gcc gcd gce gcg gco gcr gda gdc gdd gde gdo gdr gdv ge- gea gec ged gee geg geo ger gev gga ggc ggd ggg ggo ggr ggv goa goc god goe gog goo gor gov gra grc grd gre grg gro grr grv gva gvc gvd gve gvg gvo gvr oaa oac oad oae oag oao oar oav oc- oca occ ocd ocg oco ocr ocv oda odc odd ode odg odo odr odv oea oec oed oee oeg oeo oer oga ogc ogd oge ogg ogo oo- ooa ooc ood oog ooo oor oov or- ora orc ord ore org oro orr orv ov- ova ovc ovd ove ovo ovv ra- raa rac rad rae rag rao rar rav rca rcc rcd rce rcg rco rcr rcv rda rdc rdd rde rdg rdo rdr rdv re- rea rec red ree reg reo rer rev rga rgc rgd rge rgg rgo rgr rgv roa roc rod roe rog roo ror rov rra rrc rrd rrg rrr rva rvc rvd rve rvg rvo rvr rvv v-a v-e vaa vac vad vae vag vao var vav vca vcc vcd vce vco vcr vdc vdd vde vdg vdo vdr vdv vea vec ved vee veg veo ver vga vgc vgg vgo vgr voa voc vod voe vog voo vor vov vra vrc vrd vre vrg vrr vva vvc vvg vvo vvr vvv