c-cd cccc ccdc ccdr ccoc ccod ccrc ccrt cctc cctt cd-r cddr cdot coco coct codd cood coot cor- corc cord coro corr cort cotc coto cott crcc crcr crdc croc crod croo cror crot crrt crtc ctor ctot ctrc dccc dcct dctc dddd ddoc ddot ddrc doco doct dod- dodd dodo dood door doot dorc dord doro dorr dort dotd doto dott drod drot dtcc dtor dtot occc occt ocro ocrr oct- octo oddd odoo odor odot oocr oooo oord oort orco ordo oro- oror orot orro ortc orto otcd oto- otoo otor otro otto rccc rcdc rcrd rctc rdoc rocc roco rodd rodo rood roor root rorc roro rort rotc roto rotr rott rrrr rtcc rtdt tccc tcdd tctc tdor toco todd todo todt tood toor toot torc tord toro torr tort totc totd toto totr tott trcc troc trod troo trot trtc trtr tttt