-th bbb bbh bbn bbo bbt bhb bhh bho bht bnb bnn bno bnt bob boh bon boo bot btb bth btn bto btt hbb hbh hbn hbo hbt hhb hhh hhn hho hht hnb hnh hnn hno hnt hob hoh hon hoo hot htb hth htn hto htt nbb nbn nbo nbt nhb nhh nhn nht nnb nnh nnn nno nnt no- nob noh non noo not ntb nth ntn nto ntt ob- obb obh obn obo obt ohh ohn oho oht on- onb onh onn ono ont oo- oob ooh oon ooo oot ot- otb oth otn oto ott tbb tbh tbn tbo tbt th- thb thh thn tho tht tnb tnh tnn tno tnt to- tob toh ton too tot ttb tth ttn tto ttt