c-- ccc ccf ccm ccn cco cct cfc cff cfm cfn cfo cft cmc cmf cmm cmn cmo cmt cn- cnc cnf cnm cnn cno cnt co- coc cof com con coo cot ctc ctf ctm ctn cto ctt fcc fcf fcm fcn fco fct ffc fff ffm ffn ffo fft fmc fmf fmm fmn fmo fmt fnc fnf fnm fnn fnt foc fof fom fon foo fot ftc ftf ftm ftn fto ftt m-f m-o mc- mcc mcf mcm mcn mco mct mfc mff mfm mfn mfo mft mmc mmf mmm mmn mmo mmt mnc mnf mnm mnn mno mnt moc mof mom mon moo mot mtc mtf mtm mtn mto mtt ncc ncf ncm ncn nco nct nfc nff nfn nfo nft nmc nmm nmn nmo nmt nnc nnf nnm nnn nno nnt no- noc nof nom non noo not ntc ntf ntm ntn nto ntt oc- occ ocf ocm ocn oco oct of- ofc off ofm ofn ofo oft om- omc omf omm omn omo omt on- onc onf onn ono ont oo- ooc oof oom oon ooo oot ot- otc otf otm otn oto ott tcc tcf tcm tcn tco tct tfc tff tfm tfn tfo tft tmc tmf tmm tmn tmo tmt tnc tnf tnm tnn tno tnt to- toc tof tom ton too tot ttc ttf ttm ttn tto ttt