c-- ccc ccf cck cco ccs ccu cfc cff cfk cfo cfs cfu ckc cko cks cky co- coc cof cok coo cos cou coy csc csf csk cso css csu csy cuc cuf cuk cuo cus cuu cuy cyc cyf cyk cyo cys fcc fcf fck fco fcs fcu fcy ffc fff ffk ffo ffs ffu ffy fkc fkf fkk foc fof fok foo fos fou foy fsc fsf fsk fso fss fsu fuf fuk fuo fus fuu fy- fyc fyk fyo kcc kck kcs kcu kfc kff kfo kfs kfu kkc kkk kks kku kky koc kof kok koo kos kou koy ksc ksf ksk kso kss ksu kuc kuk kus kuu kuy kyc kyo kys kyu oc- occ ocf ock oco ocs ocu of- ofc off ofo ofs ofu okc okk oko oks oku oo- ooc oof ook ooo oos os- osc osf osk oso oss osu ou- ouc ouf ouk ouo ous oyo oys scc scf sck sco scs scu sfc sff sfk sfo sfs sfu sk- skc skf skk sko sks sku sky soc sof sok soo sos sou soy ss- ssc ssf ssk sso sss ssu suc suf suk suo sus suu suy sy- syc syk sys syu ucc ucf uck uco ucs ucu ufc uff ufo ufs ufu ukc ukf ukk uku uoc uok uoo uos usc usf usk uso uss usu uuc uus uuu uyc uyo uys uyu ycc ycf yco ycs ycu ycy yfc yff yfs yfu ykk yoc yof yok yoo yos you yoy ysc ysk yso yss ysu ysy yuk yuo yus yuu yuy yyc yyf yys yyu yyy