a-a a-b aaa aab aah aak aan aao ab- aba abb abh abk abn abo aha ahb ahh ahk ahn aho aka akb akh akk akn ako an- ana anb anh ank ann ano aoa aob aoh aok aon aoo baa bab bah bak ban bao bba bbb bbh bbk bbn bbo bha bhb bhh bhk bho bka bkb bkk bkn bko bna bnb bnk bnn bno boa bob boh bok bon boo haa hab hah hak han hao hba hbb hbh hbk hbn hbo hha hhb hhh hhk hhn hho hka hkb hkh hkk hkn hko hna hnb hnh hnk hnn hno hoa hob hoh hok hon hoo ka- kaa kab kah kak kan kao kba kbb kbh kbk kbn kbo kha khh khk khn kho kkb kkh kkk kkn kn- kna knk knn kno koa kob koh kok kon koo naa nab nah nak nan nao nba nbb nbk nbn nbo nha nhb nhh nhk nhn nka nkk nkn nko nna nnb nnh nnk nnn nno no- noa nob noh nok non noo oaa oab oah oak oan oao ob- oba obb obh obk obn obo oha ohh ohn oho oka okb okk oko on- ona onb onh onk onn ono oo- ooa oob ooh ook oon ooo