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Fibonacci Rabbits
In 1202 Fibonacci investigated how fast rabbits could breed.
Suppose a pair of rabbits, one male and one female, start a family. Rabbits mature at the age of one month (labeled "m") and a female produces a new pair of rabbits (labeled "n") at the end of its second month.
Suppose that the rabbits survive forever and that a female always produces one new pair (one male, one female) every month, giving the original pair and a new one.
How many pairs will there be in eight generations?


The sequence can be reproduced by a substitution system, replacing every "m" in one month by "mn" in the next and similarly replacing every "n" by "m".


"Fibonacci Rabbits" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/FibonacciRabbits/
Contributed by: Enrique Zeleny
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