c-- ccc cce ccn ccp ccs ce- cec cee cen cep ces cn- cnc cne cnn cnp cns cpc cpe cpn cpp cps csc cse csn csp css ec- ecc ece ecn ecs eec eee een eep ees en- enc ene enn enp ens ep- epc epe epn epp eps es- esc ese esn esp ess ncc nce ncn ncp ncs ne- nec nee nen nep nes nnc nne nnn nnp nns npc npe npn npp nps nsc nse nsn nsp nss p-p pcc pce pcn pcp pcs pec pee pen pep pes pn- pnc pne pnn pnp pns ppc ppe ppn ppp pps ps- psc pse psn psp pss scc sce scn scp scs se- sec see sen sep ses snc sne snn snp sns spc spe spn spp sps ss- ssc sse ssn ssp sss