-er c-- ccc cce cco ccr ccs ccz ce- cec cee ceo cer ces cez co- coc coe coo cor cos coz crc cre cro crr crs crz csc cse cso csr css csz cz- czc cze czo ec- ecc ece eco ecr ecs eec eee eeo eer ees eo- eoc eoe eoo eor eos erc ere ero err ers erz es- esc ese eso esr ess eze ezo ezr ezs ezz oc- occ oco ocr ocs ocz oec oee oeo oer oes oo- ooc ooo oor oos or- orc ore oro orr ors orz os- osc ose oso osr oss oze ozo ozs ozz rcc rce rco rcr rcs re- rec ree reo rer res rez roc roe roo ror ros roz rrc rrr rrs rsc rse rso rsr rss rze rzo scc sce sco scr scs se- sec see seo ser ses sez soc soe soo sor sos soz sr- src sre sro srr srs ss- ssc sse sso ssr sss ssz sze szr zce zco zcs zec zee zeo zer zes zez zo- zoc zoe zoo zor zos zro zrs zse zsz zzr zzs zzz