-er c-- ccc cce ccn cco ccr ccs ccz ce- cec cee cen ceo cer ces cez cn- cnc cne cnn cno cnr cns co- coc coe con coo cor cos coz crc cre crn cro crr crs crz csc cse csn cso csr css csz cz- czc cze czo ec- ecc ece ecn eco ecr ecs eec eee een eeo eer ees en- enc ene enn eno enr ens enz eo- eoc eoe eon eoo eor eos erc ere ern ero err ers erz es- esc ese esn eso esr ess eze ezo ezr ezs ezz ncc nce ncn nco ncr ncs ne- nec nee nen neo ner nes nez nnc nne nnn nno nns nnz no- noc noe non noo nor nos noz nrc nre nrn nro nrr nrs nrz nsc nse nsn nso nsr nss nsz nze nzo nzs nzz oc- occ ocn oco ocr ocs ocz oec oee oen oeo oer oes on- onc one onn ono onr ons oo- ooc oon ooo oor oos or- orc ore orn oro orr ors orz os- osc ose osn oso osr oss oze ozo ozs ozz rcc rce rcn rco rcr rcs re- rec ree ren reo rer res rez rnc rnn rno rnr rns rnz roc roe ron roo ror ros roz rrc rrn rrr rrs rsc rse rsn rso rsr rss rze rzo scc sce scn sco scr scs se- sec see sen seo ser ses sez snc sne snn sno snr sns soc soe son soo sor sos soz sr- src sre srn sro srr srs ss- ssc sse ssn sso ssr sss ssz sze szr zce zco zcs zec zee zen zeo zer zes zez znc zne znn zno zns zo- zoc zoe zon zoo zor zos zro zrs zse zsz zzr zzs zzz