What does it do? Run it!
On the first day of Christmas my true love gave to me a partridge in a pear tree.
On the second day of Christmas my true love gave to me two turtle doves and a partridge in a pear tree.
On the third day of Christmas my true love gave to me three french hens, two turtle doves and a partridge in a pear tree. ...
But why?
- http://www.research.microsoft.com/~tball/papers/XmasGift/
- Reverse engineering the Twelve Days of Christmas