cccc ccci ccic ccii ccir ccoc ccrc ccri ccrt cctc cctt cicc cici cico cicr cict ciii ciit cior circ ciri ciro cirr cirt citi cito citt coco coct coir coit coot cor- corc cori coro corr cort cotc coti coto cott crcc crcr cric crit croc croo cror crot crrt crtc ctic ctor ctot ctrc iccc icci icco iccr icct icoc icor icrc icrr icrt iiii iiio iiit iioi iioo iirc iitr iitt ioci ioii ioio ioit iooi iooo iori ioto ircc iri- iric irio iroc irrc irri irti itic itoi itoo itor itri itto occc occi occt ocro ocrr oct- octi octo oici oiii oirt oitc oiti oocr oooo oort orci orco ori- oric orio orit oro- oror orot orri orro ortc orto otic otit oto- otoo otor otro otti otto rccc rcic rctc rcti ricc rico rict riot riri riti rito ritt rocc roco roio roir roit rooi roor root rorc rori roro rort rotc roti roto rotr rott rrrr rtcc tccc tctc ticc tico tiit tiri tiro tirr titc titi tito titt toci toco toit toor toot torc tori toro torr tort totc toti toto totr tott trcc tri- tric trio trit troc troi troo trot trtc trtr tttt