c-- ccc cce cck ccp ccs ce- cec cee cek cep ces ckc cks cpc cpe cpk cpp cps csc cse csk csp css ec- ecc ece eck ecs eec eee eek eep ees ekc eke ekp eks ep- epc epe epp eps es- esc ese esk esp ess kcc kce kck kcp kcs ke- kec kee kek kep kes kkc kke kkk kkp kks kpc kpe kpk kpp kps ksc kse ksk ksp kss p-p pcc pce pck pcp pcs pec pee pek pep pes pkc pke pkp pks ppc ppe ppk ppp pps ps- psc pse psk psp pss scc sce sck scp scs se- sec see sek sep ses sk- skc ske skk skp sks spc spe spk spp sps ss- ssc sse ssk ssp sss