c-- ccc cck cco ccs ccw ckc cko cks ckw cky co- coc cok coo cos cow coy csc csk cso css csw csy cw- cwc cwk cwo cws cyc cyk cyo cys cyw kcc kck kcs kkc kkk kks kky koc kok koo kos kow koy ksc ksk kso kss ksw kw- kwc kwk kwo kws kww kyc kyo kys kyw oc- occ ock oco ocs ocw okc okk oko oks okw oo- ooc ook ooo oos oow os- osc osk oso oss osw owc owk owo ows oww oyo oys scc sck sco scs scw sk- skc skk sko sks skw sky soc sok soo sos sow soy ss- ssc ssk sso sss ssw swc swk swo sws swy sy- syc syk sys wcc wck wco wcs wcw wkc wko wks wkw wky woc wok woo wos wow woy wsc wsk wso wss wsw wwc wwo www wy- wyc wyk wyo wys ycc yco ycs ycw ycy ykk yoc yok yoo yos yow yoy ysc ysk yso yss ysy ywc yyc yys yyy