cccc cccu ccoc ccrc ccrt cctc cctt ccuc ccut coco coct cocu coot cor- corc coro corr cort cotc coto cott cotu cour cout coux crcc crcr croc croo cror crot crrt crtc crut crux ctor ctot ctrc cucc curo curr curt cut- cutc cuto cutt cxro cxxx occc occt ocro ocrr oct- octo ocur oocr oooo oort orco oro- oror orot orro ortc orto oto- otoo otor otro otto ottu otur oucc our- ouro ourt out- outo ouu- oxo- oxox oxxo rccc rctc rocc roco roor root roox rorc roro rort roru rotc roto rotr rott rout roux roxo rrrr rtcc ruct rurc ruro ruru ruto rutt rutu tccc tccu tctc toco toor toot torc toro torr tort toru torx totc toto totr tott tour tout tox- toxo toxt trcc troc troo trot trou trox trtc trtr truc trut truu trux tttt tucc tuco tuor turc turo turr turt turu tuto tutt tutu tuuo txtr ucrc ucut uocc uor- uro- uroo urox urur urut utor utto uttu uuoc uuuu uxor xoco xoro xout xoxo xtro xuxu xxxo xxxx