a-a a-c aaa aac aad aao aav aay ac- aca acc acd aco acv acy ad- ada adc add ado adv ady aoa aoc aod aoo aov av- ava avc avd avo avy ay- aya ayc ayd ayo c-- caa cac cad cao cav cay cca ccc ccd cco ccv cda cdc cdd cdo cdv cdy co- coa coc cod coo cov coy cva cvc cvd cvo cvv cya cyc cyd cyo daa dac dad dao dav day dca dcc dcd dco dcv dda ddc ddd ddo ddy doa doc dod doo dov doy dva dvc dvd dy- dya dyc dyd dyo dyy oaa oac oad oao oav oc- oca occ ocd oco ocv oda odc odd odo odv oo- ooa ooc ood ooo oov ov- ova ovc ovd ovo ovv oya oyd oyo v-a vaa vac vad vao vav vay vca vcc vcd vco vcy vdc vdd vdo vdv voa voc vod voo vov voy vva vvc vvo vvv vyd yaa yac yad yao yav yay yca ycc ycd yco ycv ycy yda ydo ydy yoc yod yoo yoy yva yvo yvy yyc yyy