c-- ccc ccr cct ccu crc crr crt cru cry ctc ctr ctt ctu cty cuc cur cut cuu cuy cyc cyr cyt rcc rcr rct rcu rrc rrr rrt rru rtc rtr rtt rtu rty ruc rur rut ruu ruy ry- ryc ryr ryu ryy tcc tcr tct tcu trc trr trt tru try ttc ttr ttt ttu tty tuc tur tut tuu tuy tyc tyr tyt ucc ucr uct ucu ur- urc urr urt uru ury utc utr utt utu uty uuc uur uut uuu uyc uyu ycc ycu ycy yrc yrt yru ytc ytr ytt ytu yur yut yuu yuy yyc yyt yyu yyy