The string posted doesn't meat the needs. Here's what I've got (84 chars):

`sub checker
{
my ($str) = @_;
for ('00' .. '99')
{
my $n = 0;
$n++ while $str =~ /$_/g;
die "'$_' appears $n times\n" if $n != 1;
}
}
sub generate
{
0 1 2 3 4 5 6
+ 7 8
#012345678901234567890123456789012345678901234567890123456789012345678
+90123456789012345
for$x(0..9){for$y(0..9){/$x$y/||(/^$y/and$_="$x$_")||(/$x$/and$_.=$y)
+or$_.="$x$y"}}$_
}
print "Generating ...\n";
my $test = generate();
print "$test\n";
print "Checking ...\n";
checker($test);
print "Ok\n";
----
Generating ...
9900102030405060708091121314151617181922324252627282933435363738394454
+6474849556575859667686977879889
Checking ...
Ok
`

I know it can be improved ...

**Update: 78 chars and counting ...**

`#0 1 2 3 4 5 6
+ 7 8
#012345678901234567890123456789012345678901234567890123456789012345678
+901234567890
for$x(0..9){for$y(0..9){/$x$y/||(/^$y/?$_=$x.$_:(/$x$/?$_.=$y:($_.=$x
+.$y)))}}$_
`

**Update: 72 chars and counting ...**

`#0 1 2 3 4 5 6
+ 7
#012345678901234567890123456789012345678901234567890123456789012345678
+9012345
for$x(0..9){for$y(0..9){/$x$y/||($_=/^$y/?$x.$_:/$x$/?$_.$y:$_.$x.$y)
+}}$_
for$x(0..9){for$y(0..9){$_=/$x$y/?$_:/^$y/?$x.$_:/$x$/?$_.$y:$_.$x.$y
+}}$_
`

------

*We are the carpenters and bricklayers of the Information Age.*

*The idea is a little like C++ templates, except not quite so brain-meltingly complicated.* -- TheDamian, Exegesis 6

Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.

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