c-cd cccc ccdc ccdr cced ccee ccrc ccre cd-e cd-r cddr cdec cder cdex cdre cec- cece cedd cede ceec cer- cerc cerd cere cexe crcc crce crcr crdc cre- crec cred cree crex cxxx dccc dcxx dddd ddrc ddre dec- decc decd dece dedd dede deed deer der- derc dere derr dex- dexe dred dree dxcc dxdc dxdr dxec dxed dxrd dxre dxrr dxrx dxxr dxxx eccc ecce ecdc eced ecrc ecrr eddc edde ede- eder edex eede eeee eerc er-x ercc erce erde erec ered erer errc erre exec exed exer exrx rccc rcdc rcde rcrd rder recc recd rece recr redc redd rede redr redx reed rerd rere rexx rred rrrr x-ed xdcc xeer xer- xexe xrcd xxxx