-th a-a a-b a-t aaa aab aad aah aan aat ab- aba abb abd abh abn abt ad- ada adb add adh adn adt aha ahb ahd ahh ahn aht an- ana anb and anh ann ant at- ata atb atd ath atn att baa bab bad bah ban bat bba bbb bbd bbh bbn bbt bda bdb bdd bdh bdt bha bhb bhd bhh bht bna bnb bnd bnn bnt bta btb btd bth btn btt daa dab dad dah dan dat dba dbb dbd dbh dbn dbt dda ddb ddd ddh ddn ddt dh- dha dhb dhd dhh dht dna dnb dnd dnh dnn dnt dta dtb dtd dth dtn dtt haa hab had hah han hat hba hbb hbd hbh hbn hbt hda hdb hdd hdh hdn hdt hha hhb hhd hhh hhn hht hna hnb hnd hnh hnn hnt hta htb htd hth htn htt naa nab nad nah nan nat nba nbb nbd nbn nbt nda ndb ndd ndh ndn ndt nha nhb nhd nhh nhn nht nna nnb nnh nnn nnt nta ntb ntd nth ntn ntt taa tab tad tah tan tat tba tbb tbd tbh tbn tbt tda tdb tdd tdh tdn tdt th- tha thb thd thh thn tht tna tnb tnd tnh tnn tnt tta ttb ttd tth ttn ttt