-th bbb bbh bbo bbr bbt bby bhb bhh bho bhr bht bob boh boo bor bot boy brb brh bro brr brt bry btb bth bto btr btt bty by- byh byo byr byt hbb hbh hbo hbr hbt hby hhb hhh hho hhr hht hhy hob hoh hoo hor hot hoy hr- hrb hrh hro hrr hrt htb hth hto htr htt hty hy- hyb hyh hyo hyr hyt hyy ob- obb obh obo obr obt oby ohh oho ohr oht oo- oob ooh ooo oor oot or- orb orh oro orr ort ory ot- otb oth oto otr ott oyo rbb rbh rbo rbr rbt rh- rhb rhh rho rhr rht rob roh roo ror rot roy rrb rrh rrr rrt rtb rto rtr rtt rty ry- ryo ryr ryy tbb tbh tbo tbr tbt th- thb thh tho thr tht thy to- tob toh too tor tot toy trb trh tro trr trt try ttb tth tto ttr ttt tty tyo tyr tyt ybr yby yht yob yoo yor yot yoy yro yrt yth yto ytr ytt yyb yyt yyy