c-cd cccc cccu ccdc ccdr ccoc ccod ccrc ccuc cd-r cddr coco cocu codd cood cor- corc cord coro corr coud cour crcc crcr crdc croc crod croo cror crud cucc curd curo curr dccc dccu dddd ddoc ddrc doco docu dod- dodd dodo dood door dorc dord doro dorr doru douc doud dour drod drou druu duco dudd dudo dudu duo- duro duru duur occc ocro ocrr ocur oddd odoo odor odou odur oocr oooo oord orco ordo ordu oro- oror orro oucc oudc our- ouro ouu- rccc rcdc rcrd rdoc rocc roco rodd rodo rood roor rorc roro roru roud rrrr rudd rudo rurc rurd ruro ruru ruud ucdc ucdd ucrc udoo uocc uor- urdu uro- uroo urur uuoc uuuu