In this article we discuss the theory behind the standard puppy-duplication tunnel and provide suggestions for optimization of puppy production. Directions for further research are indicated.

( Efficient puppy duplication mechanisms )

A continued fraction approximation to π is <3; 7, 15, 1, 293, 10, 3, 8, 2, 1, 3, 11, 1, 2, 1, 2, 1, 24, ...>.