c-- ccc cck ccr cct ccu ckc ckt crc crk crr crt cru ctc ctk ctr ctt ctu cuc cuk cur cut cuu k-t kcc kck kcr kct kcu kkc kkk kkr kkt kku krc krk krr krt kru ktc ktk ktr ktt ktu kuc kuk kur kut kuu rcc rcr rct rcu rkc rkk rkt rku rrc rrk rrr rrt rru rtc rtk rtr rtt rtu ruc ruk rur rut ruu tcc tck tcr tct tcu tkc tkk tkr tkt trc trk trr trt tru ttc ttk ttr ttt ttu tuc tuk tur tut tuu ucc uck ucr uct ucu ukc ukk ukr uku ur- urc urk urr urt uru utc utk utr utt utu uuc uur uut uuu