a-a a-b aaa aab aad aah aan aao ab- aba abb abd abh abn abo ad- ada adb add adh adn ado aha ahb ahd ahh ahn aho an- ana anb and anh ann ano aoa aob aod aoh aon aoo baa bab bad bah ban bao bba bbb bbd bbh bbn bbo bda bdb bdd bdh bdo bha bhb bhd bhh bho bna bnb bnd bnn bno boa bob bod boh bon boo daa dab dad dah dan dao dba dbb dbd dbh dbn dbo dda ddb ddd ddh ddn ddo dh- dha dhb dhd dhh dho dna dnb dnd dnh dnn dno doa dob dod doh don doo haa hab had hah han hao hba hbb hbd hbh hbn hbo hda hdb hdd hdh hdn hdo hha hhb hhd hhh hhn hho hna hnb hnd hnh hnn hno hoa hob hod hoh hon hoo naa nab nad nah nan nao nba nbb nbd nbn nbo nda ndb ndd ndh ndn ndo nha nhb nhd nhh nhn nna nnb nnh nnn nno no- noa nob nod noh non noo oaa oab oad oah oan oao ob- oba obb obd obh obn obo oda odb odd odh odn odo oha ohd ohh ohn oho on- ona onb ond onh onn ono oo- ooa oob ood ooh oon ooo