-er c-- ccc cce ccl ccp ccr ccs ce- cec cee cel cep cer ces cl- clc cle cll clp clr cls cpc cpe cpl cpp cpr cps crc cre crl crp crr crs csc cse csl csp csr css ec- ecc ece ecl ecr ecs eec eee eel eep eer ees elc ele ell elp elr els ep- epc epe epl epp epr eps erc ere erl erp err ers es- esc ese esl esp esr ess l-p lcc lce lcl lcp lcr lcs lec lee lel lep ler les llc lle lll llp llr lls lpc lpe lpl lpp lpr lps lrc lrp lrr lrs lsc lse lsl lsp lsr lss p-p pcc pce pcl pcp pcr pcs pec pee pel pep per pes plc ple pll plp plr pls ppc ppe ppl ppp ppr pps prc pre prl prp prr prs ps- psc pse psl psp psr pss rcc rce rcl rcp rcr rcs re- rec ree rel rep rer res rlc rle rll rlp rlr rls rpc rpe rpl rpp rpr rps rrc rrl rrp rrr rrs rsc rse rsl rsp rsr rss scc sce scl scp scr scs se- sec see sel sep ser ses slc sle sll slp slr sls spc spe spl spp spr sps sr- src sre srl srp srr srs ss- ssc sse ssl ssp ssr sss