My theme votes for round one:
Since I'd like you to use your brains, I decided to encode it. Enjoy figuring it out :smile:
Encode formula:
my $result = 0;
for (my $i = 0; $i < @themes; $i++)
{
$result += ($themes[$i] + 1) << ($i * 2);
}
Encoded result: 84044166