-th c-- ccc cch cco ccr cct ch- chc chh cho chr cht co- coc coh coo cor cot crc crh cro crr crt ctc cth cto ctr ctt hcc hch hco hcr hct hhc hhh hho hhr hht hoc hoh hoo hor hot hr- hrc hrh hro hrr hrt htc hth hto htr htt oc- occ och oco ocr oct ohc ohh oho ohr oht oo- ooc ooh ooo oor oot or- orc orh oro orr ort ot- otc oth oto otr ott rcc rch rco rcr rct rh- rhc rhh rho rhr rht roc roh roo ror rot rrc rrh rrr rrt rtc rto rtr rtt tcc tch tco tcr tct th- thc thh tho thr tht to- toc toh too tor tot trc trh tro trr trt ttc tth tto ttr ttt