-er eee eef eeg een eer eex ef- efe eff efg efi efr efx ege egf egg egi egn egr egx eie eif eig eii ein eir eix en- ene enf eng eni enn enr ere erf erg eri ern err ex- exe exi exr exx fee fef feg fei fen fer fex ffe fff ffg ffi ffn ffr ffx fge fgf fgg fgi fgn fgr fie fif fig fii fin fir fix fne fnf fng fni fnn fnr fnx fre frf frg fri frn frr fxe fxg fxi fxr fxx ge- gee gef geg gei gen ger gex gfe gff gfi gfr gfx ggg ggi ggn ggr gie gif gig gii gin gir gne gnf gni gnn gnr gre grf grg gri grn grr grx gxf i-f ie- iee ief ieg iei ien ier iex ife iff ifg ifi ifn ifr ifx ige igf igg igi ign igr iie iif iii iin iir iix in- ine inf ing ini inn inr inx ir- ire irf irg iri irn irr irx ixe ixi ixn n-i ne- nee nef neg nei nen ner nex nfe nff nfi nfn nfr nge ngf ngg ngi ngn nie nif nig nii nin nir nix nne nnf nng nni nnn nre nrf nrg nri nrn nrr nrx re- ree ref reg rei ren rer rex rfe rff rfg rfi rfn rfr rge rgf rgg rgi rgn rgr rgx rie rif rig rii rin rir rix rng rni rnn rnr rrf rrg rri rrn rrr rxr xee xeg xen xer xex xfe xfn xfx xge xgi xie xii xin xix xrf xrx xxi xxx