c-- ccc ccg cco ccr cct cgc cgg cgo cgr cgt co- coc cog coo cor cot crc crg cro crr crt ctc ctg cto ctr ctt gcc gcg gco gcr gct ggc ggg ggo ggr ggt goc gog goo gor got grc grg gro grr grt gtc gtg gto gtr gtt oc- occ ocg oco ocr oct ogc ogg ogo ogt oo- ooc oog ooo oor oot or- orc org oro orr ort ot- otc otg oto otr ott rcc rcg rco rcr rct rgc rgg rgo rgr rgt roc rog roo ror rot rrc rrg rrr rrt rtc rtg rto rtr rtt tcc tcg tco tcr tct tgc tgg tgo tgr tgt to- toc tog too tor tot trc trg tro trr trt ttc ttg tto ttr ttt