-th a-a a-b a-c a-t aaa aab aac aah aan aao aat ab- aba abb abc abh abn abo abt ac- aca acb acc ach acn aco act aha ahb ahc ahh ahn aho aht an- ana anb anc anh ann ano ant aoa aob aoc aoh aon aoo aot at- ata atb atc ath atn ato att baa bab bac bah ban bao bat bba bbb bbc bbh bbn bbo bbt bca bcb bcc bch bcn bco bct bha bhb bhc bhh bho bht bna bnb bnc bnn bno bnt boa bob boc boh bon boo bot bta btb btc bth btn bto btt c-- caa cab cac cah can cao cat cba cbb cbc cbh cbn cbo cbt cca ccb ccc cch ccn cco cct ch- cha chb chc chh chn cho cht cn- cna cnb cnc cnh cnn cno cnt co- coa cob coc coh con coo cot cta ctb ctc cth ctn cto ctt haa hab hac hah han hao hat hba hbb hbc hbh hbn hbo hbt hca hcb hcc hch hcn hco hct hha hhb hhc hhh hhn hho hht hna hnb hnc hnh hnn hno hnt hoa hob hoc hoh hon hoo hot hta htb htc hth htn hto htt naa nab nac nah nan nao nat nba nbb nbc nbn nbo nbt nca ncb ncc nch ncn nco nct nha nhb nhc nhh nhn nht nna nnb nnc nnh nnn nno nnt no- noa nob noc noh non noo not nta ntb ntc nth ntn nto ntt oaa oab oac oah oan oao oat ob- oba obb obc obh obn obo obt oc- oca ocb occ och ocn oco oct oha ohc ohh ohn oho oht on- ona onb onc onh onn ono ont oo- ooa oob ooc ooh oon ooo oot ot- ota otb otc oth otn oto ott taa tab tac tah tan tao tat tba tbb tbc tbh tbn tbo tbt tca tcb tcc tch tcn tco tct th- tha thb thc thh thn tho tht tna tnb tnc tnh tnn tno tnt to- toa tob toc toh ton too tot tta ttb ttc tth ttn tto ttt