a-a a-b aaa aab aag aam aao aav ab- aba abb abg abm abo abv ag- aga agb agg agm ago agv ama amb amg amm amo amv aoa aob aog aom aoo aov av- ava avb avg avm avo baa bab bag bam bao bav bba bbb bbg bbm bbo bga bgb bgg bgm bgo bgv bma bmb bmg bmm bmo bmv boa bob bog bom boo bov bva bvb bvg bvm bvo bvv gaa gab gag gam gao gav gba gbg gbm gbo gbv gga ggb ggg ggm ggo ggv gma gmb gmg gmm gmo gmv goa gob gog gom goo gov gva gvb gvg gvm gvo m-o m-v maa mab mag mam mao mav mba mbb mbg mbm mbo mbv mga mgb mgm mgo mgv mma mmb mmg mmm mmo mmv moa mob mog mom moo mov mva mvb mvg mvm mvo mvv oaa oab oag oam oao oav ob- oba obb obg obm obo obv oga ogg ogo om- oma omb omg omm omo omv oo- ooa oob oog oom ooo oov ov- ova ovb ovo ovv v-a vaa vab vag vam vao vav vba vbg vbm vbo vbv vga vgg vgm vgo vm- vma vmm vmo voa vob vog vom voo vov vva vvb vvg vvm vvo vvv