c-- ccc ccf cck ccm cco ccr ccu cfc cff cfk cfm cfo cfr cfu ckc ckm cko cmc cmf cmk cmm cmo cmr cmu co- coc cof cok com coo cor cou crc crf crk crm cro crr cru cuc cuf cuk cum cuo cur cuu fcc fcf fck fcm fco fcr fcu ffc fff ffk ffm ffo ffr ffu fkc fkf fkk fkm fmc fmf fmm fmo fmr fmu foc fof fok fom foo for fou frc frf frk frm fro frr fru fuf fuk fum fuo fur fuu kcc kck kcm kcr kcu kfc kff kfm kfo kfu kkc kkk kkm kkr kku kmc kmf kmk kmm kmo kmu koc kof kok kom koo kor kou krc krf krk kro krr kru kuc kuk kum kur kuu m-f m-o m-r mc- mcc mcf mck mcm mco mcr mcu mfc mff mfm mfo mfr mfu mkc mkk mkm mko mkr mku mmc mmf mmk mmm mmo mmr mmu moc mof mok mom moo mor mou mrc mrf mrk mrm mro mrr mru muc muf muk mum mur muu oc- occ ocf ock ocm oco ocr ocu of- ofc off ofm ofo ofr ofu okc okk oko okr oku om- omc omf omm omo omr omu oo- ooc oof ook oom ooo oor or- orc orf ork orm oro orr oru ou- ouc ouf ouk oum ouo our rcc rcf rcm rco rcr rcu rfc rff rfk rfm rfo rfr rfu rkc rkf rkk rkm rko rku rmc rmf rmm rmo rmr roc rof rok rom roo ror rou rrc rrf rrk rrm rrr rru ruc ruf ruk rum ruo rur ruu ucc ucf uck ucm uco ucr ucu ufc uff ufm ufo ufr ufu ukc ukf ukk ukr uku um- umc umf umm umo umr umu uoc uok uom uoo uor ur- urc urf urk urm uro urr uru uuc uum uur uuu