-er -ic c-- ccc cce ccf ccg cci ccn cco ccr ccs ce- cec cee cef ceg cei cen ceo cer ces cfc cfe cff cfg cfi cfn cfo cfr cfs cgc cge cgg cgi cgn cgo cgr cgs ci- cic cie cif cig cii cin cio cir cis cn- cnc cne cnf cng cni cnn cno cnr cns co- coc coe cof cog coi con coo cor cos crc cre crf crg cri crn cro crr crs csc cse csf csg csi csn cso csr css ec- ecc ece ecf ecg eci ecn eco ecr ecs eec eee eef eeg een eeo eer ees ef- efc efe eff efg efi efo efr efs egc ege egf egg egi egn ego egr egs eic eie eif eig eii ein eio eir eis en- enc ene enf eng eni enn eno enr ens eo- eoc eoe eof eog eoi eon eoo eor eos erc ere erf erg eri ern ero err ers es- esc ese esf esg esi esn eso esr ess fcc fce fcf fcg fci fcn fco fcr fcs fec fee fef feg fei fen feo fer fes ffc ffe fff ffg ffi ffn ffo ffr ffs fgc fge fgf fgg fgi fgn fgr fgs fic fie fif fig fii fin fir fis fnc fne fnf fng fni fnn fnr fns foc foe fof fog foi fon foo for fos frc fre frf frg fri frn fro frr frs fsc fse fsf fsg fsi fsn fso fsr fss gcc gce gcf gcg gci gcn gco gcr gcs ge- gec gee gef geg gei gen geo ger ges gfc gfe gff gfi gfo gfr gfs ggc ggg ggi ggn ggo ggr ggs gic gie gif gig gii gin gio gir gis gnc gne gnf gni gnn gno gnr gns goc goe gof gog goi gon goo gor gos grc gre grf grg gri grn gro grr grs gsc gse gsf gsg gsi gsn gso gsr gss i-f icc ice icf icg ici icn ico icr ics ie- iec iee ief ieg iei ien ier ies ifc ife iff ifg ifi ifn ifo ifr ifs igc ige igf igg igi ign igo igr igs iic iie iif iii iin iio iir iis in- inc ine inf ing ini inn ino inr ins io- ioc ioe iof iog ioi ion ioo ior ios ir- irc ire irf irg iri irn iro irr irs is- isc ise isf isg isi isn iso isr iss n-i ncc nce ncf ncg nci ncn nco ncr ncs ne- nec nee nef neg nei nen neo ner nes nfc nfe nff nfi nfn nfo nfr nfs ngc nge ngf ngg ngi ngn ngo ngs nic nie nif nig nii nin nio nir nis nnc nne nnf nng nni nnn nno nns no- noc noe nof nog noi non noo nor nos nrc nre nrf nrg nri nrn nro nrr nrs nsc nse nsf nsg nsi nsn nso nsr nss o-i oc- occ ocf ocg oci ocn oco ocr ocs oec oee oef oeg oei oen oeo oer oes of- ofc ofe off ofg ofi ofn ofo ofr ofs ogc oge ogf ogg ogi ogn ogo ogs oic oie oif oii oin oio oir ois on- onc one onf ong oni onn ono onr ons oo- ooc oof oog ooi oon ooo oor oos or- orc ore orf org ori orn oro orr ors os- osc ose osf osg osi osn oso osr oss rcc rce rcf rcg rci rcn rco rcr rcs re- rec ree ref reg rei ren reo rer res rfc rfe rff rfg rfi rfn rfo rfr rfs rgc rge rgf rgg rgi rgn rgo rgr rgs ric rie rif rig rii rin rio rir ris rnc rng rni rnn rno rnr rns roc roe rof rog roi ron roo ror ros rrc rrf rrg rri rrn rrr rrs rsc rse rsf rsg rsi rsn rso rsr rss scc sce scf scg sci scn sco scr scs se- sec see sef seg sei sen seo ser ses sfc sfe sff sfg sfi sfn sfo sfr sfs sgc sge sgf sgg sgi sgn sgo sgr sgs sic sie sif sig sii sin sio sir sis snc sne snf sng sni snn sno snr sns soc soe sof sog soi son soo sor sos sr- src sre srf srg sri srn sro srr srs ss- ssc sse ssf ssg ssi ssn sso ssr sss