a-a a-c aaa aac aae aaf aap aas ac- aca acc ace acf acp acs aea aec aee aef aep aes af- afa afc afe aff afp afs ap- apa apc ape apf app aps as- asa asc ase asf asp ass c-- caa cac cae caf cap cas cca ccc cce ccf ccp ccs ce- cea cec cee cef cep ces cfa cfc cfe cff cfp cfs cpa cpc cpe cpf cpp cps csa csc cse csf csp css eaa eac eae eaf eap eas ec- eca ecc ece ecf ecs eea eec eee eef eep ees ef- efa efc efe eff efp efs ep- epa epc epe epf epp eps es- esa esc ese esf esp ess faa fac fae faf fap fas fca fcc fce fcf fcp fcs fea fec fee fef fep fes ffa ffc ffe fff ffp ffs fpa fpc fpe fpp fps fsa fsc fse fsf fsp fss p-p paa pac pae paf pap pas pca pcc pce pcf pcp pcs pea pec pee pef pep pes pfa pfc pfe pff pfp pfs ppa ppc ppe ppf ppp pps ps- psa psc pse psf psp pss saa sac sae saf sap sas sca scc sce scf scp scs se- sea sec see sef sep ses sfa sfc sfe sff sfp sfs spa spc spe spf spp sps ss- ssa ssc sse ssf ssp sss