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| def compare_pow(x, y): | |
| """ | |
| Compare x**y and y**x (x, y may be non-positive) | |
| """ | |
| if x == 0 >= y or x <= 0 == y: | |
| return None | |
| if x == 0 or y == 0: | |
| return '<' if x < y else '>' |