c-- ccc ccd cco ccr cct ccu cdc cdd cdo cdr cdt cdu co- coc cod coo cor cot cou crc crd cro crr crt cru ctc ctd cto ctr ctt ctu cuc cud cuo cur cut cuu dcc dcd dco dcr dct dcu ddc ddd ddo ddr ddt ddu doc dod doo dor dot dou drc drd dro drr drt dru dtc dtd dto dtr dtt dtu duc dud duo dur dut oc- occ ocd oco ocr oct ocu odc odd odo odr odt odu oo- ooc ood ooo oor oot or- orc ord oro orr ort oru ot- otc otd oto otr ott otu ou- ouc oud ouo our out rcc rcd rco rcr rct rcu rdc rdd rdo rdr rdt rdu roc rod roo ror rot rou rrc rrd rrr rrt rru rtc rtd rto rtr rtt rtu ruc rud ruo rur rut ruu tcc tcd tco tcr tct tcu tdc tdd tdo tdr tdt tdu to- toc tod too tor tot tou trc trd tro trr trt tru ttc ttd tto ttr ttt ttu tuc tud tuo tur tut tuu ucc ucd uco ucr uct ucu udc udd udo udr udt udu uoc uod uoo uor uot ur- urc urd uro urr urt uru utc utd uto utr utt utu uuc uur uut uuu