c-- ccc cck ccn cco ccr ckc cko cky cn- cnc cnn cno cnr cny co- coc cok con coo cor coy crc crk crn cro crr cry cyc cyk cyn cyo cyr kcc kck kcn kcr kkc kkk kkn kkr kky kn- knc knk knn kno knr koc kok kon koo kor koy krc krk krn kro krr kry kyc kyn kyo kyr ncc nck ncn nco ncr nkc nkk nkn nko nkr nky nnc nnk nnn nno no- noc nok non noo nor noy nrc nrk nrn nro nrr nry nyc nyk nyn nyo nyy oc- occ ock ocn oco ocr okc okk oko okr on- onc onk onn ono onr ony oo- ooc ook oon ooo oor or- orc ork orn oro orr ory oyo rcc rcn rco rcr rkc rkk rko rky rnc rnn rno rnr rny roc rok ron roo ror roy rrc rrk rrn rrr ry- ryc ryk ryn ryo ryr ryy ycc yco ycy ykk ykn ynk ynn yny yoc yok yon yoo yor yoy yrc yrn yro yyc yyy