-th bbb bbh bbi bbo bbt bby bhb bhh bhi bho bht bi- bib bih bii bio bit biy bob boh boi boo bot boy btb bth bti bto btt bty by- byh byi byo byt h-i hbb hbh hbi hbo hbt hby hhb hhh hhi hho hht hhy hib hih hii hio hit hob hoh hoi hoo hot hoy htb hth hti hto htt hty hy- hyb hyh hyi hyo hyt hyy ibb ibh ibi ibo ibt iby ihb ihh ihi iho iht ihy iib iih iii iio iit io- iob ioh ioi ioo iot itb ith iti ito itt ity iyo iyt iyy o-i ob- obb obh obi obo obt oby ohh ohi oho oht oib oii oio oit oo- oob ooh ooi ooo oot ot- otb oth oti oto ott oyi oyo tbb tbh tbi tbo tbt th- thb thh thi tho tht thy tib tih tii tio tit tiy to- tob toh toi too tot toy ttb tth tti tto ttt tty tyo tyt ybi yby yhi yht yih yii yio yit yob yoi yoo yot yoy yth yto ytt yyb yyt yyy