a-a a-b aaa aab aag aak aao aau aav ab- aba abb abg abk abo abu abv ag- aga agb agg agk ago agu agv aka akb akg akk ako aku akv aoa aob aog aok aoo aou aov au- aua aub aug auk auo auv av- ava avb avg avk avo avu b-u baa bab bag bak bao bau bav bba bbb bbg bbk bbo bbu bga bgb bgg bgk bgo bgu bgv bka bkb bkg bkk bko bkv boa bob bog bok boo bou bov bua bub bug buk buo buu bva bvb bvg bvk bvo bvu bvv gaa gab gag gak gao gau gav gba gbg gbk gbo gbu gbv gga ggb ggg ggo ggu ggv gka gkb gko goa gob gog gok goo gou gov gu- gua gub gug guk guo guu guv gva gvb gvg gvk gvo gvu ka- kaa kab kag kak kao kau kav kba kbb kbk kbo kbu kga kgb kgo kgu kgv kkb kkk kku kkv koa kob kog kok koo kou kub kug kuk kuu kva kvb kvk kvo kvv oaa oab oag oak oao oau oav ob- oba obb obg obk obo obu obv oga ogg ogo oka okb okg okk oko oku oo- ooa oob oog ook ooo oov ou- oua ouk ouo ov- ova ovb ovo ovv ua- uaa uab uag uak uao uau uav uba ubb ubg ubk ubo ubu ubv uga ugb ugg ugk ugo ugu uka ukb ukk uku uoa uob uog uok uoo uua uug uuu uva uvb uvo uvu uvv v-a vaa vab vag vak vao vau vav vba vbg vbk vbo vbv vga vgg vgo vgu vka vkb vkg voa vob vog vok voo vou vov vug vuk vuv vva vvb vvg vvo vvv