c-- ccc cce ccf ccn ccp ce- cec cee cef cen cep cfc cfe cff cfn cfp cn- cnc cne cnf cnn cnp cpc cpe cpf cpn cpp ec- ecc ece ecf ecn eec eee eef een eep ef- efc efe eff efp en- enc ene enf enn enp ep- epc epe epf epn epp fcc fce fcf fcn fcp fec fee fef fen fep ffc ffe fff ffn ffp fnc fne fnf fnn fnp fpc fpe fpn fpp ncc nce ncf ncn ncp ne- nec nee nef nen nep nfc nfe nff nfn nfp nnc nne nnf nnn nnp npc npe npf npn npp p-p pcc pce pcf pcn pcp pec pee pef pen pep pfc pfe pff pfn pfp pn- pnc pne pnf pnn pnp ppc ppe ppf ppn ppp