a-a a-c aaa aac aae aak aap ac- aca acc ace ack acp aea aec aee aek aep aka akc ake akk akp ap- apa apc ape apk app c-- caa cac cae cak cap cca ccc cce cck ccp ce- cea cec cee cek cep cka ckc cpa cpc cpe cpk cpp eaa eac eae eak eap ec- eca ecc ece eck eea eec eee eek eep eka ekc eke ekp ep- epa epc epe epp ka- kaa kac kae kak kap kca kcc kce kck kcp ke- kea kec kee kek kep kkc kke kkk kkp kpa kpc kpe kpk kpp p-p paa pac pae pak pap pca pcc pce pck pcp pea pec pee pek pep pka pkc pke pkp ppa ppc ppe ppk ppp