c-cd cccc ccdc ccdr cced ccee ccrc ccre ccrt cctc cctt cd-e cd-r cddr cdec cder cdre cec- cece cect cedd cede cedt ceec cer- cerc cerd cere cert cet- cete crcc crce crcr crdc cre- crec cred cree cret crrt crtc ctec ctrc dccc dcct dctc dddd ddrc ddre dec- decc decd dece dect dedd dede deed deer deet der- derc dere derr dete detr dred dree dret dtcc dted eccc ecce ecct ecdc eced ecrc ecrr ect- ectc eddc edde ede- eder eede eeee eerc eetc eete ercc erce erde erec ered erer eret errc erre etcc etec etee eter etre ette rccc rcdc rcde rcet rcrd rctc rder recc recd rece recr rect redc redd rede redr reed reet rerd rere rert retd rete retr rett rred rrrr rtcc rtce rtdt rtee tccc tcdd tctc tecr tect tedd tede teec teed teer teet ter- terc tere terr tete tetr tett trcc tre- trec tred tree tret trtc trte trtr tter tttt