-th hhh hhk hho hhr hht hkh hkk hko hkr hkt hoh hok hoo hor hot hr- hrh hrk hro hrr hrt hth htk hto htr htt k-t khh khk kho khr kkh kkk kkr kkt koh kok koo kor kot krk kro krr krt kth ktk kto ktr ktt ohh oho ohr oht okk oko okr oo- ooh ook ooo oor oot or- orh ork oro orr ort ot- oth otk oto otr ott rh- rhh rho rhr rht rkk rko rkt roh rok roo ror rot rrh rrk rrr rrt rtk rto rtr rtt th- thh thk tho thr tht tkk tko tkr tkt to- toh tok too tor tot trh trk tro trr trt tth ttk tto ttr ttt