a-a a-c aaa aac aae aak aap aas ac- aca acc ace ack acp acs aea aec aee aek aep aes aka akc ake akk akp aks ap- apa apc ape apk app aps as- asa asc ase ask asp ass c-- caa cac cae cak cap cas cca ccc cce cck ccp ccs ce- cea cec cee cek cep ces cka ckc cks cpa cpc cpe cpk cpp cps csa csc cse csk csp css eaa eac eae eak eap eas ec- eca ecc ece eck ecs eea eec eee eek eep ees eka ekc eke ekp eks ep- epa epc epe epp eps es- esa esc ese esk esp ess ka- kaa kac kae kak kap kas kca kcc kce kck kcp kcs ke- kea kec kee kek kep kes kkc kke kkk kkp kks kpa kpc kpe kpk kpp kps ksa ksc kse ksk ksp kss p-p paa pac pae pak pap pas pca pcc pce pck pcp pcs pea pec pee pek pep pes pka pkc pke pkp pks ppa ppc ppe ppk ppp pps ps- psa psc pse psk psp pss saa sac sae sak sap sas sca scc sce sck scp scs se- sea sec see sek sep ses sk- ska skc ske skk skp sks spa spc spe spk spp sps ss- ssa ssc sse ssk ssp sss