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The following diagram shows the four calls involved when the
recursivePowerOf2 method is set to work on 3:
Arguments | ^ Returned values
3 v | 8
*-------------*
| First call |
*-------------*
| ^
2 v | 4
*-------------*
| Second call |
*-------------*
| ^
1 v | 2
*-------------*
| Third call |
*-------------*
| ^
0 v | 1
*-------------*
| Fourth call |
*-------------*