a-a a-b aaa aab aah aan aav ab- aba abb abh abn abv aha ahb ahh ahn ahv an- ana anb anh ann anv av- ava avb avh avn baa bab bah ban bav bba bbb bbh bbn bha bhb bhh bhv bna bnb bnn bnv bva bvb bvh bvn bvv haa hab hah han hav hba hbb hbh hbn hbv hha hhb hhh hhn hhv hna hnb hnh hnn hnv hv- hva hvb hvn hvv naa nab nah nan nav nba nbb nbn nbv nha nhb nhh nhn nhv nna nnb nnh nnn nnv nva nvb nvh nvn nvv v-a vaa vab vah van vav vba vbh vbv vh- vha vhb vn- vna vnv vva vvb vvv