cccc cccp ccoc ccpp ccpr ccrc ccrp ccrt cctc cctt coco cocp coct coop coot copo copp copr copt cor- corc coro corp corr cort cotc coto cott cprt cptp cptr crcc crcr croc croo crop cror crot crpc crrt crtc crtp ctcp ctor ctot ctpo ctpp ctrc ctrp occc occt ocpp ocro ocrr oct- octo oocr oooo oort ootp opo- opor oppo opto orco oro- oror orot orpc orro ortc orto oto- otoo otor otpp otro otto pccc pcpp pcrc poco poop poor poot pop- popc popo popp popt porc poro porr port potc poto pott ppcc pppo pppp pprc pptt prcc prcp pro- proc proo prop prot prtc prtp prtr ptcc ptop pttc rccc rcpo rcpt rctc rocc roco roop roor root ropo rorc roro rort rotc roto rotr rott rrrr rtcc rttp tccc tcpo tctc toco toor toot top- topo topp topt torc toro torp torr tort totc toto totr tott tpcp tppp tppr tptp tptr trcc troc troo trop trot trpc trpp trtc trtr ttcp ttop tttt