a-a a-c aaa aac aae aap aas ac- aca acc ace acp acs aea aec aee aep aes ap- apa apc ape app aps as- asa asc ase asp ass c-- caa cac cae cap cas cca ccc cce ccp ccs ce- cea cec cee cep ces cpa cpc cpe cpp cps csa csc cse csp css eaa eac eae eap eas ec- eca ecc ece ecs eea eec eee eep ees ep- epa epc epe epp eps es- esa esc ese esp ess p-p paa pac pae pap pas pca pcc pce pcp pcs pea pec pee pep pes ppa ppc ppe ppp pps ps- psa psc pse psp pss saa sac sae sap sas sca scc sce scp scs se- sea sec see sep ses spa spc spe spp sps ss- ssa ssc sse ssp sss