cccc ccnc ccnr ccoc ccrc ccrt cctc cctt cnco cnrc cnrr cnrt cntc cntr coco coct con- conc conn cono cont coon coot cor- corc corn coro corr cort cotc cotn coto cott crcc crcr croc cron croo cror crot crrt crtc ctor ctot ctrc ctrn cttn nccc nccn nccr ncct ncnc ncoc ncor ncrc nctc nctr nnnn nnot nntn noco noct non- nonn nono nont noo- noon nooo noor noot nor- norc norn noro norr nort not- noto nott nroc nron nrrc ntcc ntrc ntto nttr occc occn occt ocon ocro ocrr oct- octo onc- onco onct onno onon onor ont- ontc onto oocr oont oooo oort orco ornc orno oro- oron oror orot orro ortc orto oto- oton otoo otor otro otto rccc rcnr rcon rctc rnco rnnt rnot rocc roco ronc rono ront roon roor root rorc roro rort rotc rotn roto rotr rott rrrr rtcc tccc tcnn tcon tctc tncc toco tonn tono toon toor toot torc torn toro torr tort totc toto totr tott trcc trno troc tron troo trot trtc trtr ttcn tton tttt