c-- ccc cck ccr ccs cct ccu ckc cks ckt crc crk crr crs crt cru csc csk csr css cst csu ctc ctk ctr cts ctt ctu cuc cuk cur cus cut cuu k-t kcc kck kcr kcs kct kcu kkc kkk kkr kks kkt kku krc krk krr krs krt kru ksc ksk ksr kss kst ksu ktc ktk ktr kts ktt ktu kuc kuk kur kus kut kuu rcc rcr rcs rct rcu rkc rkk rks rkt rku rrc rrk rrr rrs rrt rru rsc rsk rsr rss rst rsu rtc rtk rtr rts rtt rtu ruc ruk rur rus rut ruu scc sck scr scs sct scu sk- skc skk skr sks skt sku sr- src srk srr srs srt ss- ssc ssk ssr sss sst ssu stc stk str sts stt stu suc suk sur sus sut suu tcc tck tcr tcs tct tcu tkc tkk tkr tks tkt trc trk trr trs trt tru tsc tsk tsr tss tst tsu ttc ttk ttr tts ttt ttu tuc tuk tur tus tut tuu ucc uck ucr ucs uct ucu ukc ukk ukr uku ur- urc urk urr urs urt uru usc usk usr uss ust usu utc utk utr uts utt utu uuc uur uus uut uuu