cccc ccoc ccrc ccrt cctc cctt ckck ckco ckoc ckoo ckor ckot ckrc cock coco coct cok- coko cook coot cor- corc cork coro corr cort cotc coto cott crcc crcr crkc croc crok croo cror crot crrt crtc ctor ctot ctrc kccc kcck kccr kcct kckc kckk kcko kckr kcor kcot kcrc kcro kcrr kcrt kctc kcto kkck kkco kkcr kkct kkkk kkoo kkor kkot kkrc kkrk kkro kkrr kkrt kktc kktk kock koct kokc kokk koko kokr kooc kook kooo koor koot korc kork koro korr kort kotc kotk koto kotr kott krcc krco krkc krkk krko krkr kroc krok kroo kror krrc krrk krro krrr krrt krtc krtk krto krtr ktcc ktck ktco ktcr ktkc ktkk ktko ktkr ktkt ktoc ktok ktoo ktor ktot ktrc ktrk ktro ktrr ktrt kttc kttk ktto kttr kttt occc occt ocro ocrr oct- octo okko okok okor okot okro okto oocr oooo oort orco orko oro- orok oror orot orro ortc orto oto- otok otoo otor otro otto rccc rctc rocc rock roco rokk roko rokr rook roor root rorc rork roro rort rotc rotk roto rotr rott rrrr rtcc tccc tctc tock toco toko took toor toot torc tork toro torr tort totc toto totr tott trcc troc troo trot trtc trtr tttt