-er c-- ccc cce cch cco ccr ccs ce- cec cee ceh ceo cer ces ch- chc che chh cho chr chs co- coc coe coh coo cor cos crc cre crh cro crr crs csc cse csh cso csr css ec- ecc ece ech eco ecr ecs eec eee eeo eer ees ehc ehe ehh eho ehr ehs eo- eoc eoe eoh eoo eor eos erc ere erh ero err ers es- esc ese esh eso esr ess hcc hce hch hco hcr hcs he- hec hee heh heo her hes hhc hhe hhh hho hhr hhs hoc hoe hoh hoo hor hos hr- hrc hre hrh hro hrr hrs hsc hse hsh hsr hss oc- occ och oco ocr ocs oec oee oeh oeo oer oes ohc ohe ohh oho ohr ohs oo- ooc ooh ooo oor oos or- orc ore orh oro orr ors os- osc ose osh oso osr oss rcc rce rch rco rcr rcs re- rec ree reh reo rer res rh- rhc rhe rhh rho rhr rhs roc roe roh roo ror ros rrc rrh rrr rrs rsc rse rsh rso rsr rss scc sce sch sco scr scs se- sec see seh seo ser ses sh- shc she shh sho shr shs soc soe soh soo sor sos sr- src sre srh sro srr srs ss- ssc sse ssh sso ssr sss