a-a a-b aaa aab aak aan aao aaw ab- aba abb abk abn abo abw aka akb akk akn ako akw an- ana anb ank ann ano aoa aob aok aon aoo aow aw- awa awb awk awn awo aww baa bab bak ban bao baw bba bbb bbk bbn bbo bbw bka bkb bkk bkn bko bkw bna bnb bnk bnn bno bnw boa bob bok bon boo bow bwa bwb bwk bwo ka- kaa kab kak kan kao kaw kba kbb kbk kbn kbo kbw kkb kkk kkn kn- kna knk knn kno koa kob kok kon koo kow kw- kwa kwk kwo kww naa nab nak nan nao naw nba nbb nbk nbn nbo nbw nka nkk nkn nko nna nnb nnk nnn nno nnw no- noa nob nok non noo now nwa nwb nwn nwo oaa oab oak oan oao oaw ob- oba obb obk obn obo obw oka okb okk oko okw on- ona onb onk onn ono oo- ooa oob ook oon ooo oow owa owb owk own owo oww waa wab wak wan wao waw wba wbb wbn wbo wbw wka wkb wko wkw wn- wna wnn wno wnw woa wob wok won woo wow wwa wwn wwo www