c-- ccc ccd cco cct ccu cdc cdd cdo cdt cdu co- coc cod coo cot cou ctc ctd cto ctt ctu cuc cud cuo cut cuu dcc dcd dco dct dcu ddc ddd ddo ddt ddu doc dod doo dot dou dtc dtd dto dtt dtu duc dud duo dut oc- occ ocd oco oct ocu odc odd odo odt odu oo- ooc ood ooo oot ot- otc otd oto ott otu ou- ouc oud ouo out tcc tcd tco tct tcu tdc tdd tdo tdt tdu to- toc tod too tot tou ttc ttd tto ttt ttu tuc tud tuo tut tuu ucc ucd uco uct ucu udc udd udo udt udu uoc uod uoo uot utc utd uto utt utu uuc uut uuu