a-a a-b aaa aab aag aah aak aan aao ab- aba abb abg abh abk abn abo ag- aga agb agg agh agk agn ago aha ahb ahg ahh ahk ahn aho aka akb akg akh akk akn ako an- ana anb ang anh ank ann ano aoa aob aog aoh aok aon aoo baa bab bag bah bak ban bao bba bbb bbg bbh bbk bbn bbo bga bgb bgg bgh bgk bgn bgo bha bhb bhg bhh bhk bho bka bkb bkg bkk bkn bko bna bnb bng bnk bnn bno boa bob bog boh bok bon boo gaa gab gag gah gak gan gao gba gbg gbh gbk gbn gbo gga ggb ggg ggh ggn ggo gha ghb ghg ghh ghn gho gka gkb gkh gkn gko gna gnb gnn gno goa gob gog goh gok gon goo haa hab hag hah hak han hao hba hbb hbg hbh hbk hbn hbo hga hgb hgg hgh hgk hgn hgo hha hhb hhg hhh hhk hhn hho hka hkb hkg hkh hkk hkn hko hna hnb hng hnh hnk hnn hno hoa hob hog hoh hok hon hoo ka- kaa kab kag kah kak kan kao kba kbb kbh kbk kbn kbo kga kgb kgh kgo kha khh khk khn kho kkb kkh kkk kkn kn- kna kng knk knn kno koa kob kog koh kok kon koo naa nab nag nah nak nan nao nba nbb nbg nbk nbn nbo nga ngb ngg ngh ngk ngn ngo nha nhb nhg nhh nhk nhn nka nkk nkn nko nna nnb nng nnh nnk nnn nno no- noa nob nog noh nok non noo oaa oab oag oah oak oan oao ob- oba obb obg obh obk obn obo oga ogg ogh ogn ogo oha ohg ohh ohn oho oka okb okg okk oko on- ona onb ong onh onk onn ono oo- ooa oob oog ooh ook oon ooo