c-- ccc cck ccn cco ccr ccu ckc cko cn- cnc cnn cno cnr cnu co- coc cok con coo cor cou crc crk crn cro crr cru cuc cuk cun cuo cur cuu kcc kck kcn kcr kcu kkc kkk kkn kkr kku kn- knc knk knn kno knr knu koc kok kon koo kor kou krc krk krn kro krr kru kuc kuk kun kur kuu ncc nck ncn nco ncr ncu nkc nkk nkn nko nkr nku nnc nnk nnn nno nnu no- noc nok non noo nor nou nrc nrk nrn nro nrr nru nuc nuk nun nuo nur nuu oc- occ ock ocn oco ocr ocu okc okk oko okr oku on- onc onk onn ono onr onu oo- ooc ook oon ooo oor or- orc ork orn oro orr oru ou- ouc ouk oun ouo our rcc rcn rco rcr rcu rkc rkk rko rku rnc rnn rno rnr rnu roc rok ron roo ror rou rrc rrk rrn rrr rru ruc ruk run ruo rur ruu ucc uck ucn uco ucr ucu ukc ukk ukn ukr uku un- unc unk unn uno unr unu uoc uok uon uoo uor ur- urc urk urn uro urr uru uuc uun uur uuu