a-a a-c aaa aac aae aak aan aap ac- aca acc ace ack acn acp aea aec aee aek aen aep aka akc ake akk akn akp an- ana anc ane ank ann anp ap- apa apc ape apk apn app c-- caa cac cae cak can cap cca ccc cce cck ccn ccp ce- cea cec cee cek cen cep cka ckc cn- cna cnc cne cnn cnp cpa cpc cpe cpk cpn cpp eaa eac eae eak ean eap ec- eca ecc ece eck ecn eea eec eee eek een eep eka ekc eke ekp en- ena enc ene enk enn enp ep- epa epc epe epn epp ka- kaa kac kae kak kan kap kca kcc kce kck kcn kcp ke- kea kec kee kek ken kep kkc kke kkk kkn kkp kn- kna knc kne knk knn knp kpa kpc kpe kpk kpn kpp naa nac nae nak nan nap nca ncc nce nck ncn ncp ne- nea nec nee nek nen nep nka nkc nke nkk nkn nkp nna nnc nne nnk nnn nnp npa npc npe npn npp p-p paa pac pae pak pan pap pca pcc pce pck pcn pcp pea pec pee pek pen pep pka pkc pke pkn pkp pn- pna pnc pne pnk pnn pnp ppa ppc ppe ppk ppn ppp