-er eee eef eeo eer ef- efe eff efi efo efr eie eif eii eio eir eo- eoe eof eoi eoo eor ere erf eri ero err fee fef fei feo fer ffe fff ffi ffo ffr fie fif fii fir foe fof foi foo for fre frf fri fro frr i-f ie- iee ief iei ier ife iff ifi ifo ifr iie iif iii iio iir io- ioe iof ioi ioo ior ir- ire irf iri iro irr o-i oee oef oei oeo oer of- ofe off ofi ofo ofr oie oif oii oio oir oo- oof ooi ooo oor or- ore orf ori oro orr re- ree ref rei reo rer rfe rff rfi rfo rfr rie rif rii rio rir roe rof roi roo ror rrf rri rrr