-er c-- ccc cce ccf ccg ccn cco ccr ccs ce- cec cee cef ceg cen ceo cer ces cfc cfe cff cfg cfn cfo cfr cfs cgc cge cgg cgn cgo cgr cgs cn- cnc cne cnf cng cnn cno cnr cns co- coc coe cof cog con coo cor cos crc cre crf crg crn cro crr crs csc cse csf csg csn cso csr css ec- ecc ece ecf ecg ecn eco ecr ecs eec eee eef eeg een eeo eer ees ef- efc efe eff efg efo efr efs egc ege egf egg egn ego egr egs en- enc ene enf eng enn eno enr ens eo- eoc eoe eof eog eon eoo eor eos erc ere erf erg ern ero err ers es- esc ese esf esg esn eso esr ess fcc fce fcf fcg fcn fco fcr fcs fec fee fef feg fen feo fer fes ffc ffe fff ffg ffn ffo ffr ffs fgc fge fgf fgg fgn fgr fgs fnc fne fnf fng fnn fnr fns foc foe fof fog fon foo for fos frc fre frf frg frn fro frr frs fsc fse fsf fsg fsn fso fsr fss gcc gce gcf gcg gcn gco gcr gcs ge- gec gee gef geg gen geo ger ges gfc gfe gff gfo gfr gfs ggc ggg ggn ggo ggr ggs gnc gne gnf gnn gno gnr gns goc goe gof gog gon goo gor gos grc gre grf grg grn gro grr grs gsc gse gsf gsg gsn gso gsr gss ncc nce ncf ncg ncn nco ncr ncs ne- nec nee nef neg nen neo ner nes nfc nfe nff nfn nfo nfr nfs ngc nge ngf ngg ngn ngo ngs nnc nne nnf nng nnn nno nns no- noc noe nof nog non noo nor nos nrc nre nrf nrg nrn nro nrr nrs nsc nse nsf nsg nsn nso nsr nss oc- occ ocf ocg ocn oco ocr ocs oec oee oef oeg oen oeo oer oes of- ofc ofe off ofg ofn ofo ofr ofs ogc oge ogf ogg ogn ogo ogs on- onc one onf ong onn ono onr ons oo- ooc oof oog oon ooo oor oos or- orc ore orf org orn oro orr ors os- osc ose osf osg osn oso osr oss rcc rce rcf rcg rcn rco rcr rcs re- rec ree ref reg ren reo rer res rfc rfe rff rfg rfn rfo rfr rfs rgc rge rgf rgg rgn rgo rgr rgs rnc rng rnn rno rnr rns roc roe rof rog ron roo ror ros rrc rrf rrg rrn rrr rrs rsc rse rsf rsg rsn rso rsr rss scc sce scf scg scn sco scr scs se- sec see sef seg sen seo ser ses sfc sfe sff sfg sfn sfo sfr sfs sgc sge sgf sgg sgn sgo sgr sgs snc sne snf sng snn sno snr sns soc soe sof sog son soo sor sos sr- src sre srf srg srn sro srr srs ss- ssc sse ssf ssg ssn sso ssr sss