c-- ccc ccf cco ccr ccs ccu cfc cff cfo cfr cfs cfu co- coc cof coo cor cos cou coy crc crf cro crr crs cru cry csc csf cso csr css csu csy cuc cuf cuo cur cus cuu cuy cyc cyf cyo cyr cys fcc fcf fco fcr fcs fcu fcy ffc fff ffo ffr ffs ffu ffy foc fof foo for fos fou foy frc frf fro frr frs fru fry fsc fsf fso fsr fss fsu fuf fuo fur fus fuu fy- fyc fyo oc- occ ocf oco ocr ocs ocu of- ofc off ofo ofr ofs ofu oo- ooc oof ooo oor oos or- orc orf oro orr ors oru ory os- osc osf oso osr oss osu ou- ouc ouf ouo our ous oyo oys rcc rcf rco rcr rcs rcu rfc rff rfo rfr rfs rfu roc rof roo ror ros rou roy rrc rrf rrr rrs rru rsc rsf rso rsr rss rsu ruc ruf ruo rur rus ruu ruy ry- ryc ryf ryo ryr rys ryu ryy scc scf sco scr scs scu sfc sff sfo sfr sfs sfu soc sof soo sor sos sou soy sr- src srf sro srr srs sry ss- ssc ssf sso ssr sss ssu suc suf suo sur sus suu suy sy- syc syr sys syu ucc ucf uco ucr ucs ucu ufc uff ufo ufr ufs ufu uoc uoo uor uos ur- urc urf uro urr urs uru ury usc usf uso usr uss usu uuc uur uus uuu uyc uyo uys uyu ycc ycf yco ycs ycu ycy yfc yff yfr yfs yfu yoc yof yoo yor yos you yoy yrc yrf yro yrs yru ysc yso ysr yss ysu ysy yuo yur yus yuu yuy yyc yyf yys yyu yyy