c-- ccc ccf cco ccr cct cfc cff cfo cfr cft co- coc cof coo cor cot coy crc crf cro crr crt cry ctc ctf cto ctr ctt cty cyc cyf cyo cyr cyt fcc fcf fco fcr fct fcy ffc fff ffo ffr fft ffy foc fof foo for fot foy frc frf fro frr frt fry ftc ftf fto ftr ftt fty fy- fyc fyo oc- occ ocf oco ocr oct of- ofc off ofo ofr oft oo- ooc oof ooo oor oot or- orc orf oro orr ort ory ot- otc otf oto otr ott oyo rcc rcf rco rcr rct rfc rff rfo rfr rft roc rof roo ror rot roy rrc rrf rrr rrt rtc rtf rto rtr rtt rty ry- ryc ryf ryo ryr ryy tcc tcf tco tcr tct tfc tff tfo tfr tft to- toc tof too tor tot toy trc trf tro trr trt try ttc ttf tto ttr ttt tty tyc tyf tyo tyr tyt ycc ycf yco ycy yfc yff yfr yft yoc yof yoo yor yot yoy yrc yrf yro yrt ytc ytf yto ytr ytt yyc yyf yyt yyy