a-a a-c aaa aac aae aan aap ac- aca acc ace acn acp aea aec aee aen aep an- ana anc ane ann anp ap- apa apc ape apn app c-- caa cac cae can cap cca ccc cce ccn ccp ce- cea cec cee cen cep cn- cna cnc cne cnn cnp cpa cpc cpe cpn cpp eaa eac eae ean eap ec- eca ecc ece ecn eea eec eee een eep en- ena enc ene enn enp ep- epa epc epe epn epp naa nac nae nan nap nca ncc nce ncn ncp ne- nea nec nee nen nep nna nnc nne nnn nnp npa npc npe npn npp p-p paa pac pae pan pap pca pcc pce pcn pcp pea pec pee pen pep pn- pna pnc pne pnn pnp ppa ppc ppe ppn ppp