-er -ic c-- ccc cce ccf ccg cci cco ccr ce- cec cee cef ceg cei ceo cer cfc cfe cff cfg cfi cfo cfr cgc cge cgg cgi cgo cgr ci- cic cie cif cig cii cio cir co- coc coe cof cog coi coo cor crc cre crf crg cri cro crr ec- ecc ece ecf ecg eci eco ecr eec eee eef eeg eeo eer ef- efc efe eff efg efi efo efr egc ege egf egg egi ego egr eic eie eif eig eii eio eir eo- eoc eoe eof eog eoi eoo eor erc ere erf erg eri ero err fcc fce fcf fcg fci fco fcr fec fee fef feg fei feo fer ffc ffe fff ffg ffi ffo ffr fgc fge fgf fgg fgi fgr fic fie fif fig fii fir foc foe fof fog foi foo for frc fre frf frg fri fro frr gcc gce gcf gcg gci gco gcr ge- gec gee gef geg gei geo ger gfc gfe gff gfi gfo gfr ggc ggg ggi ggo ggr gic gie gif gig gii gio gir goc goe gof gog goi goo gor grc gre grf grg gri gro grr i-f icc ice icf icg ici ico icr ie- iec iee ief ieg iei ier ifc ife iff ifg ifi ifo ifr igc ige igf igg igi igo igr iic iie iif iii iio iir io- ioc ioe iof iog ioi ioo ior ir- irc ire irf irg iri iro irr o-i oc- occ ocf ocg oci oco ocr oec oee oef oeg oei oeo oer of- ofc ofe off ofg ofi ofo ofr ogc oge ogf ogg ogi ogo oic oie oif oii oio oir oo- ooc oof oog ooi ooo oor or- orc ore orf org ori oro orr rcc rce rcf rcg rci rco rcr re- rec ree ref reg rei reo rer rfc rfe rff rfg rfi rfo rfr rgc rge rgf rgg rgi rgo rgr ric rie rif rig rii rio rir roc roe rof rog roi roo ror rrc rrf rrg rri rrr