a-a a-b aaa aab aag aan aav ab- aba abb abg abn abv ag- aga agb agg agn agv an- ana anb ang ann anv av- ava avb avg avn baa bab bag ban bav bba bbb bbg bbn bga bgb bgg bgn bgv bna bnb bng bnn bnv bva bvb bvg bvn bvv gaa gab gag gan gav gba gbg gbn gbv gga ggb ggg ggn ggv gna gnb gnn gnv gva gvb gvg gvn naa nab nag nan nav nba nbb nbg nbn nbv nga ngb ngg ngn nna nnb nng nnn nnv nva nvb nvg nvn nvv v-a vaa vab vag van vav vba vbg vbv vga vgg vgn vn- vna vng vnv vva vvb vvg vvv