-er c-- ccc cce cch ccr ccs ccx ce- cec cee ceh cer ces cex ch- chc che chh chr chs chx crc cre crh crr crs crx csc cse csh csr css csx cxc cxh cxr cxs cxx ec- ecc ece ech ecr ecs ecx eec eee eer ees eex ehc ehe ehh ehr ehs erc ere erh err ers es- esc ese esh esr ess esx ex- exc exe exh exr exs exx hcc hce hch hcr hcs he- hec hee heh her hes hex hhc hhe hhh hhr hhs hr- hrc hre hrh hrr hrs hsc hse hsh hsr hss hsx hxc rcc rce rch rcr rcs rcx re- rec ree reh rer res rex rh- rhc rhe rhh rhr rhs rrc rrh rrr rrs rsc rse rsh rsr rss rsx rxr rxs scc sce sch scr scs scx se- sec see seh ser ses sex sh- shc she shh shr shs sr- src sre srh srr srs srx ss- ssc sse ssh ssr sss ssx sxc sxs xch xcr xcx xee xer xes xex xrc xrx xsc xss xxx