c-- ccc cco ccr cct ccu co- coc coo cor cot cou crc cro crr crt cru ctc cto ctr ctt ctu cuc cuo cur cut cuu oc- occ oco ocr oct ocu oo- ooc ooo oor oot or- orc oro orr ort oru ot- otc oto otr ott otu ou- ouc ouo our out rcc rco rcr rct rcu roc roo ror rot rou rrc rrr rrt rru rtc rto rtr rtt rtu ruc ruo rur rut ruu tcc tco tcr tct tcu to- toc too tor tot tou trc tro trr trt tru ttc tto ttr ttt ttu tuc tuo tur tut tuu ucc uco ucr uct ucu uoc uoo uor uot ur- urc uro urr urt uru utc uto utr utt utu uuc uur uut uuu