a-a a-b aaa aab aag aan aao aav ab- aba abb abg abn abo abv ag- aga agb agg agn ago agv an- ana anb ang ann ano anv aoa aob aog aon aoo aov av- ava avb avg avn avo baa bab bag ban bao bav bba bbb bbg bbn bbo bga bgb bgg bgn bgo bgv bna bnb bng bnn bno bnv boa bob bog bon boo bov bva bvb bvg bvn bvo bvv gaa gab gag gan gao gav gba gbg gbn gbo gbv gga ggb ggg ggn ggo ggv gna gnb gnn gno gnv goa gob gog gon goo gov gva gvb gvg gvn gvo naa nab nag nan nao nav nba nbb nbg nbn nbo nbv nga ngb ngg ngn ngo nna nnb nng nnn nno nnv no- noa nob nog non noo nov nva nvb nvg nvn nvv oaa oab oag oan oao oav ob- oba obb obg obn obo obv oga ogg ogn ogo on- ona onb ong onn ono oo- ooa oob oog oon ooo oov ov- ova ovb ovo ovv v-a vaa vab vag van vao vav vba vbg vbo vbv vga vgg vgn vgo vn- vna vng vno vnv voa vob vog von voo vov vva vvb vvg vvo vvv