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The following diagram shows the rabbits method works, given the task
of determining the number of Fibonacci rabbits at the end of 3 months:
Arguments | ^ Returned values
3 | | 3
v |
*-------------*
| First call |
*-------------*
| ^ | ^
2 | | 1 | *------------*
| | *-------------* |
v | 2 v | 1
*-------------* *-------------*
| Second call | | Fifth call |
*-------------* *-------------*
| ^ | ^
1 | | 0 | *------------*
| | *-------------* |
v | 1 v | 1
*-------------* *-------------*
| Third call | | Fourth call |
*-------------* *-------------*