-th a-a a-b a-t aaa aab aad aah aan aao aat ab- aba abb abd abh abn abo abt ad- ada adb add adh adn ado adt aha ahb ahd ahh ahn aho aht an- ana anb and anh ann ano ant aoa aob aod aoh aon aoo aot at- ata atb atd ath atn ato att baa bab bad bah ban bao bat bba bbb bbd bbh bbn bbo bbt bda bdb bdd bdh bdo bdt bha bhb bhd bhh bho bht bna bnb bnd bnn bno bnt boa bob bod boh bon boo bot bta btb btd bth btn bto btt daa dab dad dah dan dao dat dba dbb dbd dbh dbn dbo dbt dda ddb ddd ddh ddn ddo ddt dh- dha dhb dhd dhh dho dht dna dnb dnd dnh dnn dno dnt doa dob dod doh don doo dot dta dtb dtd dth dtn dto dtt haa hab had hah han hao hat hba hbb hbd hbh hbn hbo hbt hda hdb hdd hdh hdn hdo hdt hha hhb hhd hhh hhn hho hht hna hnb hnd hnh hnn hno hnt hoa hob hod hoh hon hoo hot hta htb htd hth htn hto htt naa nab nad nah nan nao nat nba nbb nbd nbn nbo nbt nda ndb ndd ndh ndn ndo ndt nha nhb nhd nhh nhn nht nna nnb nnh nnn nno nnt no- noa nob nod noh non noo not nta ntb ntd nth ntn nto ntt oaa oab oad oah oan oao oat ob- oba obb obd obh obn obo obt oda odb odd odh odn odo odt oha ohd ohh ohn oho oht on- ona onb ond onh onn ono ont oo- ooa oob ood ooh oon ooo oot ot- ota otb otd oth otn oto ott taa tab tad tah tan tao tat tba tbb tbd tbh tbn tbo tbt tda tdb tdd tdh tdn tdo tdt th- tha thb thd thh thn tho tht tna tnb tnd tnh tnn tno tnt to- toa tob tod toh ton too tot tta ttb ttd tth ttn tto ttt