-th b-p bbb bbh bbo bbp bbt bhb bhh bho bhp bht bob boh boo bop bot bpb bph bpo bpp bpt btb bth bto btp btt hbb hbh hbo hbp hbt hhb hhh hho hhp hht hob hoh hoo hop hot hpb hph hpo hpp hpt htb hth hto htp htt ob- obb obh obo obp obt ohh oho ohp oht oo- oob ooh ooo oop oot op- opb oph opo opp opt ot- otb oth oto otp ott p-p pbb pbo pbp pbt phb pho php pht pob poh poo pop pot ppb pph ppo ppp ppt pt- ptb pth pto ptp ptt tbb tbh tbo tbp tbt th- thb thh tho thp tht to- tob toh too top tot tpb tph tpo tpp tpt ttb tth tto ttp ttt