a-a a-c aaa aac aad aao aav ac- aca acc acd aco acv ad- ada adc add ado adv aoa aoc aod aoo aov av- ava avc avd avo c-- caa cac cad cao cav cca ccc ccd cco ccv cda cdc cdd cdo cdv co- coa coc cod coo cov cva cvc cvd cvo cvv daa dac dad dao dav dca dcc dcd dco dcv dda ddc ddd ddo doa doc dod doo dov dva dvc dvd 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 v-a vaa vac vad vao vav vca vcc vcd vco vdc vdd vdo vdv voa voc vod voo vov vva vvc vvo vvv