c-- ccc ccg cck cco ccs cct cgc cgg cgo cgs cgt ckc cko cks ckt co- coc cog cok coo cos cot csc csg csk cso css cst ctc ctg ctk cto cts ctt gcc gcg gck gco gcs gct ggc ggg ggo ggs ggt gko gks gkt goc gog gok goo gos got gsc gsg gsk gso gss gst gtc gtg gtk gto gts gtt k-t kcc kcg kck kcs kct kgc kgo kgs kkc kkk kks kkt koc kog kok koo kos kot ksc ksg ksk kso kss kst ktc ktg ktk kto kts ktt oc- occ ocg ock oco ocs oct ogc ogg ogo ogs ogt okc okg okk oko oks oo- ooc oog ook ooo oos oot os- osc osg osk oso oss ost ot- otc otg otk oto ots ott scc scg sck sco scs sct sgc sgg sgk sgo sgs sgt sk- skc skg skk sko sks skt soc sog sok soo sos sot ss- ssc ssg ssk sso sss sst stc stg stk sto sts stt tcc tcg tck tco tcs tct tgc tgg tgk tgo tgs tgt tkc tkg tkk tko tks tkt to- toc tog tok too tos tot tsc tsg tsk tso tss tst ttc ttg ttk tto tts ttt