a-a aaa aad aae aaf aao ad- ada add ade adf ado aea aed aee aef aeo af- afa afd afe aff afo aoa aod aoe aof aoo daa dad dae daf dao dda ddd dde ddf ddo de- dea ded dee def deo dfa dfd dfe dff dfo doa dod doe dof doo eaa ead eae eaf eao ed- eda edd ede edf edo eea eed eee eef eeo ef- efa efd efe eff efo eo- eoa eod eoe eof eoo faa fad fae faf fao fda fdd fde fdf fdo fea fed fee fef feo ffa ffd ffe fff ffo foa foe fof foo oaa oad oae oaf oao oda odd ode odf odo oea oed oee oef oeo of- ofa ofd ofe off ofo oo- ooa ood oof ooo