c-cd cccc ccdc ccdn ccdr ccnc ccnr ccoc ccod ccrc cd-r cddr cdnc cdon cnco cndd cnrc cnrr coco codd con- conc cond conn cono cood coon cor- corc cord corn coro corr crcc crcr crdc croc crod cron croo cror dccc dcon dddd ddoc ddrc dnoc dnrc doco dod- dodd dodo donc dond donn dono donr dood doon door dorc dord dorn doro dorr drno drod dron nccc nccn nccr ncdc ncdn ncdr ncnc ncnd ncoc ncor ncrc ndcc nddo ndoc ndor ndrc nnnn noco nodo non- nonn nono noo- noon nooo noor nor- norc nord norn noro norr nrdc nroc nron nrrc nrrd occc occn ocon ocro ocrr oddd odon odoo odor onc- oncd onco ondo onno onod onon onor oocr oooo oord orco ordn ordo ornc orno oro- oron oror orro rccc rcdc rcnr rcon rcrd rdoc rnco rndc rnod rocc roco rodd rodo ronc rond rono rood roon roor rorc roro rrrr