a-a a-c aaa aac aan aao aav ac- aca acc acn aco acv an- ana anc ann ano anv aoa aoc aon aoo aov av- ava avc avn avo c-- caa cac can cao cav cca ccc ccn cco ccv cn- cna cnc cnn cno cnv co- coa coc con coo cov cva cvc cvn cvo cvv naa nac nan nao nav nca ncc ncn nco ncv nna nnc nnn nno nnv no- noa noc non noo nov nva nvc nvn nvv oaa oac oan oao oav oc- oca occ ocn oco ocv on- ona onc onn ono oo- ooa ooc oon ooo oov ov- ova ovc ovo ovv v-a vaa vac van vao vav vca vcc vcn vco vn- vna vno vnv voa voc von voo vov vva vvc vvo vvv