-up c-- ccc ccf cco ccp ccu cfc cff cfo cfp cfu co- coc cof coo cop cou cpc cpf cpo cpp cpu cuc cuf cuo cup cuu fcc fcf fco fcp fcu ffc fff ffo ffp ffu foc fof foo fop fou fpc fpo fpp fpu fuf fuo fup fuu oc- occ ocf oco ocp ocu of- ofc off ofo ofp ofu oo- ooc oof ooo oop op- opc opf opo opp ou- ouc ouf ouo oup p-p pcc pcf pco pcp pcu pfc pff pfo pfp pfu poc pof poo pop pou ppc ppf ppo ppp ppu puc puf pup puu ucc ucf uco ucp ucu ufc uff ufo ufp ufu uoc uoo uop up- upc upf upo upp upu uuc uuu