c-- ccc ccf ccm cco ccr cct cfc cff cfm cfo cfr cft cmc cmf cmm cmo cmr cmt cmy co- coc cof com coo cor cot coy crc crf crm cro crr crt cry ctc ctf ctm cto ctr ctt cty cyc cyf cym cyo cyr cyt fcc fcf fcm fco fcr fct fcy ffc fff ffm ffo ffr fft ffy fmc fmf fmm fmo fmr fmt foc fof fom foo for fot foy frc frf frm fro frr frt fry ftc ftf ftm fto ftr ftt fty fy- fyc fyo m-f m-o m-r mc- mcc mcf mcm mco mcr mct mfc mff mfm mfo mfr mft mfy mmc mmf mmm mmo mmr mmt moc mof mom moo mor mot moy mrc mrf mrm mro mrr mrt mry mtc mtf mtm mto mtr mtt my- myc myf mym myo myr myt oc- occ ocf ocm oco ocr oct of- ofc off ofm ofo ofr oft om- omc omf omm omo omr omt omy oo- ooc oof oom ooo oor oot or- orc orf orm oro orr ort ory ot- otc otf otm oto otr ott oyo rcc rcf rcm rco rcr rct rfc rff rfm rfo rfr rft rmc rmf rmm rmo rmr rmt roc rof rom roo ror rot roy rrc rrf rrm rrr rrt rtc rtf rtm rto rtr rtt rty ry- ryc ryf rym ryo ryr ryy tcc tcf tcm tco tcr tct tfc tff tfm tfo tfr tft tmc tmf tmm tmo tmr tmt tmy to- toc tof tom too tor tot toy trc trf trm tro trr trt try ttc ttf ttm tto ttr ttt tty tyc tyf tym tyo tyr tyt ycc ycf yco ycy yfc yff yfm yfr yft ymc ymm ymo ymt yoc yof yom yoo yor yot yoy yrc yrf yro yrt ytc ytf ytm yto ytr ytt yyc yyf yyt yyy