-er c-- ccc cce ccf ccn cco ccr ccs ce- cec cee cef cen ceo cer ces cfc cfe cff cfn cfo cfr cfs cn- cnc cne cnf cnn cno cnr cns co- coc coe cof con coo cor cos crc cre crf crn cro crr crs csc cse csf csn cso csr css ec- ecc ece ecf ecn eco ecr ecs eec eee eef een eeo eer ees ef- efc efe eff efo efr efs en- enc ene enf enn eno enr ens eo- eoc eoe eof eon eoo eor eos erc ere erf ern ero err ers es- esc ese esf esn eso esr ess fcc fce fcf fcn fco fcr fcs fec fee fef fen feo fer fes ffc ffe fff ffn ffo ffr ffs fnc fne fnf fnn fnr fns foc foe fof fon foo for fos frc fre frf frn fro frr frs fsc fse fsf fsn fso fsr fss ncc nce ncf ncn nco ncr ncs ne- nec nee nef nen neo ner nes nfc nfe nff nfn nfo nfr nfs nnc nne nnf nnn nno nns no- noc noe nof non noo nor nos nrc nre nrf nrn nro nrr nrs nsc nse nsf nsn nso nsr nss oc- occ ocf ocn oco ocr ocs oec oee oef oen oeo oer oes of- ofc ofe off ofn ofo ofr ofs on- onc one onf onn ono onr ons oo- ooc oof oon ooo oor oos or- orc ore orf orn oro orr ors os- osc ose osf osn oso osr oss rcc rce rcf rcn rco rcr rcs re- rec ree ref ren reo rer res rfc rfe rff rfn rfo rfr rfs rnc rnn rno rnr rns roc roe rof ron roo ror ros rrc rrf rrn rrr rrs rsc rse rsf rsn rso rsr rss scc sce scf scn sco scr scs se- sec see sef sen seo ser ses sfc sfe sff sfn sfo sfr sfs snc sne snf snn sno snr sns soc soe sof son soo sor sos sr- src sre srf srn sro srr srs ss- ssc sse ssf ssn sso ssr sss