a-a a-c aaa aac aah aao aav ac- aca acc ach aco acv aha ahc ahh aho ahv aoa aoc aoh aoo aov av- ava avc avh avo c-- caa cac cah cao cav cca ccc cch cco ccv ch- cha chc chh cho chv co- coa coc coh coo cov cva cvc cvh cvo cvv haa hac hah hao hav hca hcc hch hco hcv hha hhc hhh hho hhv hoa hoc hoh hoo hov hv- hva hvc hvo hvv oaa oac oah oao oav oc- oca occ och oco ocv oha ohc ohh oho oo- ooa ooc ooh ooo oov ov- ova ovc ovh ovo ovv v-a vaa vac vah vao vav vca vcc vch vco vh- vha vhc vho voa voc voh voo vov vva vvc vvo vvv