a-a a-b aaa aab aad aah aak aan aao ab- aba abb abd abh abk abn abo ad- ada adb add adh adk adn ado aha ahb ahd ahh ahk ahn aho aka akb akd akh akk akn ako an- ana anb and anh ank ann ano aoa aob aod aoh aok aon aoo baa bab bad bah bak ban bao bba bbb bbd bbh bbk bbn bbo bda bdb bdd bdh bdk bdo bha bhb bhd bhh bhk bho bka bkb bkk bkn bko bna bnb bnd bnk bnn bno boa bob bod boh bok bon boo daa dab dad dah dak dan dao dba dbb dbd dbh dbk dbn dbo dda ddb ddd ddh ddk ddn ddo dh- dha dhb dhd dhh dhk dho dka dkb dkk dko dna dnb dnd dnh dnk dnn dno doa dob dod doh dok don doo haa hab had hah hak han hao hba hbb hbd hbh hbk hbn hbo hda hdb hdd hdh hdk hdn hdo hha hhb hhd hhh hhk hhn hho hka hkb hkd hkh hkk hkn hko hna hnb hnd hnh hnk hnn hno hoa hob hod hoh hok hon hoo ka- kaa kab kad kah kak kan kao kba kbb kbd kbh kbk kbn kbo kda kdb kdh kdk kdo kha khh khk khn kho kkb kkh kkk kkn kn- kna knd knk knn kno koa kob kod koh kok kon koo naa nab nad nah nak nan nao nba nbb nbd nbk nbn nbo nda ndb ndd ndh ndk ndn ndo nha nhb nhd nhh nhk nhn nka nkk nkn nko nna nnb nnh nnk nnn nno no- noa nob nod noh nok non noo oaa oab oad oah oak oan oao ob- oba obb obd obh obk obn obo oda odb odd odh odn odo oha ohd ohh ohn oho oka okb okd okk oko on- ona onb ond onh onk onn ono oo- ooa oob ood ooh ook oon ooo