Reproducing Rabbits

Multiply Reproducing Rabbit's power and
toughness by the amount of other cards sharing
its name on the battlefield. At the beginning of
your upkeep add 14 1/1 baby rabbit tokens for
each Reproducing Rabbit pair on the battlefield.
You may have any number of cards in your
library named Reproducing Rabbit.
What can I learn from a rabbit?
How to multiply.