c-- ccc cck cco ccr ccs cct ccu ckc cko cks ckt co- coc cok coo cor cos cot cou crc crk cro crr crs crt cru csc csk cso csr css cst csu ctc ctk cto ctr cts ctt ctu cuc cuk cuo cur cus cut cuu k-t kcc kck kcr kcs kct kcu kkc kkk kkr kks kkt kku koc kok koo kor kos kot kou krc krk kro krr krs krt kru ksc ksk kso ksr kss kst ksu ktc ktk kto ktr kts ktt ktu kuc kuk kur kus kut kuu oc- occ ock oco ocr ocs oct ocu okc okk oko okr oks oku oo- ooc ook ooo oor oos oot or- orc ork oro orr ors ort oru os- osc osk oso osr oss ost osu ot- otc otk oto otr ots ott otu ou- ouc ouk ouo our ous out rcc rco rcr rcs rct rcu rkc rkk rko rks rkt rku roc rok roo ror ros rot rou rrc rrk rrr rrs rrt rru rsc rsk rso rsr rss rst rsu rtc rtk rto rtr rts rtt rtu ruc ruk ruo rur rus rut ruu scc sck sco scr scs sct scu sk- skc skk sko skr sks skt sku soc sok soo sor sos sot sou sr- src srk sro srr srs srt ss- ssc ssk sso ssr sss sst ssu stc stk sto str sts stt stu suc suk suo sur sus sut suu tcc tck tco tcr tcs tct tcu tkc tkk tko tkr tks tkt to- toc tok too tor tos tot tou trc trk tro trr trs trt tru tsc tsk tso tsr tss tst tsu ttc ttk tto ttr tts ttt ttu tuc tuk tuo tur tus tut tuu ucc uck uco ucr ucs uct ucu ukc ukk ukr uku uoc uok uoo uor uos uot ur- urc urk uro urr urs urt uru usc usk uso usr uss ust usu utc utk uto utr uts utt utu uuc uur uus uut uuu