And in the spirit of jethro's analysis, here's a simpler method: 
my $length = 4;
my $b = Math::NumberBase->new($length-1);
my $start = 0;
my $end = $b->to_decimal("${\($length-2)}" x $length);

print "$_\n" for
    map {join'', map {$_+1} split(//,$b->from_decimal($_))}
    $start .. $end;

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In reply to Re^2: Generating lists of strings by Anonymous Monk
in thread Generating lists of strings by Anonymous Monk

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