Very nice!

How about generating the table with Perl instead of a text editor? I'll just borrow the regexes you and enoch provided, if you don't mind :D

my %lookup;

foreach my $alpha ('a'..'k') {
   foreach my $numb (0..9) {
      $_ = $alpha . $numb;
      $lookup{$_} = /^g[6-9]$/ ? 1 : /^[gk][0-5]$/ ? .5 : 0;
   }
}
[download]

however, this is not very efficient if your memory is tied behind your back. ;)

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 perl -le '$x="jeff";$x++ for(0..4482550);print $x'
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