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| import math, random | |
| def lgcd(x, y): | |
| if x < y: | |
| return lgcd(y, x) | |
| shift = max(x.bit_length() // 64, y.bit_length() // 64) | |
| xbar = x >> (shift * 64) | |
| ybar = y >> (shift * 64) | |
| while y > 2**64: |