a-a a-b aaa aab aae aag aak aao aav ab- aba abb abe abg abk abo abv aea aeb aee aeg aek aeo aev ag- aga agb age agg agk ago agv aka akb ake akg akk ako akv aoa aob aoe aog aok aoo aov av- ava avb ave avg avk avo baa bab bae bag bak bao bav bba bbb bbe bbg bbk bbo be- bea beb bee beg bek beo bev bga bgb bge bgg bgk bgo bgv bka bkb bke bkg bkk bko bkv boa bob boe bog bok boo bov bva bvb bve bvg bvk bvo bvv eaa eab eae eag eak eao eav eba ebb ebe ebg ebk ebo ebv eea eeb eee eeg eek eeo eev ega egb ege egg ego eka ekb eke ekg eko ekv eo- eoa eob eoe eog eok eoo eva evb eve evg evo evv gaa gab gae gag gak gao gav gba gbe gbg gbk gbo gbv ge- gea geb gee geg gek geo gev gga ggb ggg ggo ggv gka gkb gko goa gob goe gog gok goo gov gva gvb gve gvg gvk gvo ka- kaa kab kae kag kak kao kav kba kbb kbe kbk kbo ke- kea keb kee keg kek keo kev kga kgb kgo kgv kkb kke kkk kkv koa kob koe kog kok koo kva kvb kvk kvo kvv oaa oab oae oag oak oao oav ob- oba obb obe obg obk obo obv oea oeb oee oeg oeo oga oge ogg ogo oka okb oke okg okk oko oo- ooa oob oog ook ooo oov ov- ova ovb ove ovo ovv v-a v-e vaa vab vae vag vak vao vav vba vbg vbk vbo vbv vea veb vee veg vek veo vga vgg vgo vka vkb vkg voa vob voe vog vok voo vov vva vvb vvg vvo vvv