-er c-- ccc cce ccp ccr ccs ce- cec cee cep cer ces cpc cpe cpp cpr cps crc cre crp crr crs csc cse csp csr css ec- ecc ece ecr ecs eec eee eep eer ees ep- epc epe epp epr eps erc ere erp err ers es- esc ese esp esr ess p-p pcc pce pcp pcr pcs pec pee pep per pes ppc ppe ppp ppr pps prc pre prp prr prs ps- psc pse psp psr pss rcc rce rcp rcr rcs re- rec ree rep rer res rpc rpe rpp rpr rps rrc rrp rrr rrs rsc rse rsp rsr rss scc sce scp scr scs se- sec see sep ser ses spc spe spp spr sps sr- src sre srp srr srs ss- ssc sse ssp ssr sss