a-a a-c aaa aac aad aae aaf aag aao ac- aca acc acd ace acf acg aco ad- ada adc add ade adf adg ado aea aec aed aee aef aeg aeo af- afa afc afd afe aff afg afo ag- aga agc agd age agf agg ago aoa aoc aod aoe aof aog aoo c-- caa cac cad cae caf cag cao cca ccc ccd cce ccf ccg cco cda cdc cdd cde cdf cdg cdo ce- cea cec ced cee cef ceg ceo cfa cfc cfd cfe cff cfg cfo cga cgc cgd cge cgg cgo co- coa coc cod coe cof cog coo daa dac dad dae daf dag dao dca dcc dcd dce dcf dcg dco dda ddc ddd dde ddf ddg ddo de- dea dec ded dee def deg deo dfa dfc dfd dfe dff dfg dfo dga dgc dgd dge dgf dgg doa doc dod doe dof dog doo eaa eac ead eae eaf eag eao ec- eca ecc ecd ece ecf ecg eco ed- eda edc edd ede edf edg edo eea eec eed eee eef eeg eeo ef- efa efc efd efe eff efg efo ega egc egd ege egf egg ego eo- eoa eoc eod eoe eof eog eoo faa fac fad fae faf fag fao fca fcc fcd fce fcf fcg fco fda fdc fdd fde fdf fdg fdo fea fec fed fee fef feg feo ffa ffc ffd ffe fff ffg ffo fga fgc fgd fge fgf fgg foa foc foe fof fog foo g-d gaa gac gad gae gaf gag gao gca gcc gcd gce gcf gcg gco gda gdc gdd gde gdf gdo ge- gea gec ged gee gef geg geo gfa gfc gfd gfe gff gfo gga ggc ggd ggg ggo goa goc god goe gof gog goo oaa oac oad oae oaf oag oao oc- oca occ ocd ocf ocg oco oda odc odd ode odf odg odo oea oec oed oee oef oeg oeo of- ofa ofc ofd ofe off ofg ofo oga ogc ogd oge ogf ogg ogo oo- ooa ooc ood oof oog ooo