c-- ccc cce ccf ccp ccs ce- cec cee cef cep ces cfc cfe cff cfp cfs cpc cpe cpf cpp cps csc cse csf csp css ec- ecc ece ecf ecs eec eee eef eep ees ef- efc efe eff efp efs ep- epc epe epf epp eps es- esc ese esf esp ess fcc fce fcf fcp fcs fec fee fef fep fes ffc ffe fff ffp ffs fpc fpe fpp fps fsc fse fsf fsp fss p-p pcc pce pcf pcp pcs pec pee pef pep pes pfc pfe pff pfp pfs ppc ppe ppf ppp pps ps- psc pse psf psp pss scc sce scf scp scs se- sec see sef sep ses sfc sfe sff sfp sfs spc spe spf spp sps ss- ssc sse ssf ssp sss