c-- ccc cck cco ccs ccu ckc cko cks cky co- coc cok coo cos cou coy csc csk cso css csu csy cuc cuk cuo cus cuu cuy cyc cyk cyo cys kcc kck kcs kcu kkc kkk kks kku kky koc kok koo kos kou koy ksc ksk kso kss ksu kuc kuk kus kuu kuy kyc kyo kys kyu oc- occ ock oco ocs ocu okc okk oko oks oku oo- ooc ook ooo oos os- osc osk oso oss osu ou- ouc ouk ouo ous oyo oys scc sck sco scs scu sk- skc skk sko sks sku sky soc sok soo sos sou soy ss- ssc ssk sso sss ssu suc suk suo sus suu suy sy- syc syk sys syu ucc uck uco ucs ucu ukc ukk uku uoc uok uoo uos usc usk uso uss usu uuc uus uuu uyc uyo uys uyu ycc yco ycs ycu ycy ykk yoc yok yoo yos you yoy ysc ysk yso yss ysu ysy yuk yuo yus yuu yuy yyc yys yyu yyy