-th a-a a-b a-t aaa aab aah aan aao aat ab- aba abb abh abn abo abt aha ahb ahh ahn aho aht an- ana anb anh ann ano ant aoa aob aoh aon aoo aot at- ata atb ath atn ato att baa bab bah ban bao bat bba bbb bbh bbn bbo bbt bha bhb bhh bho bht bna bnb bnn bno bnt boa bob boh bon boo bot bta btb bth btn bto btt haa hab hah han hao hat hba hbb hbh hbn hbo hbt hha hhb hhh hhn hho hht hna hnb hnh hnn hno hnt hoa hob hoh hon hoo hot hta htb hth htn hto htt naa nab nah nan nao nat nba nbb nbn nbo nbt nha nhb nhh nhn nht nna nnb nnh nnn nno nnt no- noa nob noh non noo not nta ntb nth ntn nto ntt oaa oab oah oan oao oat ob- oba obb obh obn obo obt oha ohh ohn oho oht on- ona onb onh onn ono ont oo- ooa oob ooh oon ooo oot ot- ota otb oth otn oto ott taa tab tah tan tao tat tba tbb tbh tbn tbo tbt th- tha thb thh thn tho tht tna tnb tnh tnn tno tnt to- toa tob toh ton too tot tta ttb tth ttn tto ttt