-er c-- ccc cce cco ccr ccs ce- cec cee ceo ceq cer ces co- coc coe coo coq cor cos cqc cqo cqs crc cre cro crq crr crs csc cse cso csq csr css ec- ecc ece eco ecq ecr ecs eec eee eeo eer ees eo- eoc eoe eoo eoq eor eos eqe eqq eqs erc ere ero erq err ers es- esc ese eso esq esr ess oc- occ oco ocr ocs oec oee oeo oer oes oo- ooc ooo oor oos oqo or- orc ore oro orr ors os- osc ose oso osq osr oss qcc qco qcs qec qee qeo qoo qor qos qqq qrc qre qrs qsc qso qsr rcc rce rco rcr rcs re- rec ree reo req rer res roc roe roo ror ros rqc rqs rrc rrq rrr rrs rsc rse rso rsq rsr rss scc sce sco scr scs se- sec see seo seq ser ses soc soe soo soq sor sos sqq sqr sqs sr- src sre sro srq srr srs ss- ssc sse sso ssq ssr sss