a-a a-c aaa aac aae aaf aan aap ac- aca acc ace acf acn acp aea aec aee aef aen aep af- afa afc afe aff afn afp an- ana anc ane anf ann anp ap- apa apc ape apf apn app c-- caa cac cae caf can cap cca ccc cce ccf ccn ccp ce- cea cec cee cef cen cep cfa cfc cfe cff cfn cfp cn- cna cnc cne cnf cnn cnp cpa cpc cpe cpf cpn cpp eaa eac eae eaf ean eap ec- eca ecc ece ecf ecn eea eec eee eef een eep ef- efa efc efe eff efp en- ena enc ene enf enn enp ep- epa epc epe epf epn epp faa fac fae faf fan fap fca fcc fce fcf fcn fcp fea fec fee fef fen fep ffa ffc ffe fff ffn ffp fna fnc fne fnf fnn fnp fpa fpc fpe fpn fpp naa nac nae naf nan nap nca ncc nce ncf ncn ncp ne- nea nec nee nef nen nep nfa nfc nfe nff nfn nfp nna nnc nne nnf nnn nnp npa npc npe npf npn npp p-p paa pac pae paf pan pap pca pcc pce pcf pcn pcp pea pec pee pef pen pep pfa pfc pfe pff pfn pfp pn- pna pnc pne pnf pnn pnp ppa ppc ppe ppf ppn ppp