c-- ccc ccg cck ccn cco ccr cgc cgg cgn cgo cgr ckc cko cn- cnc cng cnn cno cnr co- coc cog cok con coo cor crc crg crk crn cro crr gcc gcg gck gcn gco gcr ggc ggg ggn ggo ggr gkn gko gnc gnn gno gnr goc gog gok gon goo gor grc grg grk grn gro grr kcc kcg kck kcn kcr kgc kgo kkc kkk kkn kkr kn- knc kng knk knn kno knr koc kog kok kon koo kor krc krg krk krn kro krr ncc ncg nck ncn nco ncr ngc ngg ngk ngn ngo nkc nkk nkn nko nkr nnc nng nnk nnn nno no- noc nog nok non noo nor nrc nrg nrk nrn nro nrr oc- occ ocg ock ocn oco ocr ogc ogg ogn ogo okc okg okk oko okr on- onc ong onk onn ono onr oo- ooc oog ook oon ooo oor or- orc org ork orn oro orr rcc rcg rcn rco rcr rgc rgg rgk rgn rgo rgr rkc rkg rkk rko rnc rng rnn rno rnr roc rog rok ron roo ror rrc rrg rrk rrn rrr