c-- ccc cck ccn cco ccr cct ckc cko ckt cn- cnc cnn cno cnr cnt co- coc cok con coo cor cot crc crk crn cro crr crt ctc ctk ctn cto ctr ctt k-t kcc kck kcn kcr kct kkc kkk kkn kkr kkt kn- knc knk knn kno knr knt koc kok kon koo kor kot krc krk krn kro krr krt ktc ktk ktn kto ktr ktt ncc nck ncn nco ncr nct nkc nkk nkn nko nkr nkt nnc nnk nnn nno nnt no- noc nok non noo nor not nrc nrk nrn nro nrr nrt ntc ntk ntn nto ntr ntt oc- occ ock ocn oco ocr oct okc okk oko okr on- onc onk onn ono onr ont oo- ooc ook oon ooo oor oot or- orc ork orn oro orr ort ot- otc otk otn oto otr ott rcc rcn rco rcr rct rkc rkk rko rkt rnc rnn rno rnr rnt roc rok ron roo ror rot rrc rrk rrn rrr rrt rtc rtk rtn rto rtr rtt tcc tck tcn tco tcr tct tkc tkk tko tkr tkt tnc tnk tnn tno tnr tnt to- toc tok ton too tor tot trc trk trn tro trr trt ttc ttk ttn tto ttr ttt