c-- ccc cch cck cco ccr ch- chc chh chk cho chr ckc ckh cko co- coc coh cok coo cor crc crh crk cro crr hcc hch hck hco hcr hhc hhh hhk hho hhr hkh hkk hko hkr hoc hoh hok hoo hor hr- hrc hrh hrk hro hrr kcc kch kck kcr khh khk kho khr kkc kkh kkk kkr koc koh kok koo kor krc krk kro krr oc- occ och ock oco ocr ohc ohh oho ohr okc okk oko okr oo- ooc ooh ook ooo oor or- orc orh ork oro orr rcc rch rco rcr rh- rhc rhh rho rhr rkc rkk rko roc roh rok roo ror rrc rrh rrk rrr