c-cd cccc cccu ccdc ccdr ccrc ccuc cd-r cddr crcc crcr crdc crud crux cry- cucc curd curr cury cuy- cuyr cxxx cyc- cycc cyy- cyyc dc-y dccc dccu dcxx dddd ddrc ddry druu dry- dudd dudu duru dury duur duyr dxcc dxdc dxdr dxrd dxrr dxrx dxur dxxr dxxx dxyr dycd dycu dydd dyr- dyrc dyru dyrx dyur dyxc dyxr dyxx dyxy dyyr rccc rcdc rcrd rcyc rrrr rudd rudy rurc rurd ruru ruud ruyd rydy ucdc ucdd ucrc urcy urdu urdy urry urur uuuu xdcc xrcd xuxu xxxx xxxy xyr- yccc yudu yurd yury yuxu yuyu yyyy