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| def pow_r(x, n): | |
| if n == 0: | |
| return 1 | |
| return multiply(x, pow_r(x, n - 1)) | |
| def multiply(f1, f2): | |
| def _multiply(a, b): | |
| if b == 1: | |
| return a | |
| return a + multiply(a, b - 1) | |
| if f1 < f2: | |
| return _multiply(f2, f1) | |
| return _multiply(f1, f2) |
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