c-- ccc ccg cck cco ccr ccs cct cgc cgg cgo cgr cgs cgt ckc cko cks ckt co- coc cog cok coo cor cos cot crc crg crk cro crr crs crt csc csg csk cso csr css cst ctc ctg ctk cto ctr cts ctt gcc gcg gck gco gcr gcs gct ggc ggg ggo ggr ggs ggt gko gks gkt goc gog gok goo gor gos got grc grg grk gro grr grs grt gsc gsg gsk gso gsr gss gst gtc gtg gtk gto gtr gts gtt k-t kcc kcg kck kcr kcs kct kgc kgo kgs kkc kkk kkr kks kkt koc kog kok koo kor kos kot krc krg krk kro krr krs krt ksc ksg ksk kso ksr kss kst ktc ktg ktk kto ktr kts ktt oc- occ ocg ock oco ocr ocs oct ogc ogg ogo ogs ogt okc okg okk oko okr oks oo- ooc oog ook ooo oor oos oot or- orc org ork oro orr ors ort os- osc osg osk oso osr oss ost ot- otc otg otk oto otr ots ott rcc rcg rco rcr rcs rct rgc rgg rgk rgo rgr rgs rgt rkc rkg rkk rko rks rkt roc rog rok roo ror ros rot rrc rrg rrk rrr rrs rrt rsc rsg rsk rso rsr rss rst rtc rtg rtk rto rtr rts rtt scc scg sck sco scr scs sct sgc sgg sgk sgo sgr sgs sgt sk- skc skg skk sko skr sks skt soc sog sok soo sor sos sot sr- src srg srk sro srr srs srt ss- ssc ssg ssk sso ssr sss sst stc stg stk sto str sts stt tcc tcg tck tco tcr tcs tct tgc tgg tgk tgo tgr tgs tgt tkc tkg tkk tko tkr tks tkt to- toc tog tok too tor tos tot trc trg trk tro trr trs trt tsc tsg tsk tso tsr tss tst ttc ttg ttk tto ttr tts ttt