Just a tiny little cheat :)
#!/usr/bin/perl
# http://perlmonks.org/?node_id=1201500
use strict;
use warnings;
$| = 1;
my $file = '/usr/share/dict/words';
open my $fh, '<', $file or die "$! opening $file";
while(<$fh>)
{
chomp;
/[^a-z]/ and next;
"$_\n$_" =~ /^
(?= .* (.) .* \n (?: (?:(?!\1).)* \1 ){1} (?:(?!\1).)
+* $ )
(?= .* (.) .* \n (?: (?:(?!\2).)* \2 ){2} (?:(?!\2).)
+* $ )
(?= .{3,3} \n | .* (.) .* \n (?: (?:(?!\3).)* \3 ){3} (?:(?!\3).)
+* $ )
(?= .{3,6} \n | .* (.) .* \n (?: (?:(?!\4).)* \4 ){4} (?:(?!\4).)
+* $ )
(?= .{3,10} \n | .* (.) .* \n (?: (?:(?!\5).)* \5 ){5} (?:(?!\5).)
+* $ )
(?= .{3,15} \n | .* (.) .* \n (?: (?:(?!\6).)* \6 ){6} (?:(?!\6).)
+* $ )
(?= .{3,21} \n | .* (.) .* \n (?: (?:(?!\7).)* \7 ){7} (?:(?!\7).)
+* $ )
(?= .{3,28} \n | .* (.) .* \n (?: (?:(?!\8).)* \8 ){8} (?:(?!\8).)
+* $ )
(?= .{3,35} \n )
/x and print "$_ ";
}
print "\n";
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