cccc cccu cccv ccoc ccrc ccrt cctc cctt cctv ccuc ccut ccvo coco coct cocu coot cor- corc coro corr cort cotc coto cott cotu cour cout covo crcc crcr croc croo cror crot crrt crtc crtv crut ctor ctot ctrc ctvo ctvt cucc curo curr curt cut- cutc cuto cutt cutv cvcc cvrr occc occt ocro ocrr oct- octo ocur oocr oooo oort orco oro- oror orot orro ortc orto orvr oto- otoo otor otov otro otto ottu otur oucc our- ouro ourt out- outo ouu- ovo- ovoo ovot rccc rctc rctv rcuv rcvr rocc roco roor root rorc roro rort roru rotc roto rotr rott rout rovo rrrr rtcc ruct rurc ruro ruru ruto rutt rutu ruvu rv-c tccc tccu tcov tctc toco toor toot torc toro torr tort toru torv totc toto totr tott tour tout touv tovo trcc troc troo trot trou trtc trtr truc trut truu tttt tucc tuco tuor turc turo turr turt turu tuto tutt tutu tuuo tvro tvrr tvtv ucrc uctv ucut uocc uor- uovo uro- uroo urur urut utor utto uttu uuoc uuuu uv-c uvvu vooc voor voot vor- voro vort voru voto vour vout vroc vrot vrto vuco vurt vutv vvvv