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import math
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fn test_gcd() {
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assert math.gcd(6, 9) == 3
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assert math.gcd(6, -9) == 3
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assert math.gcd(-6, -9) == 3
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assert math.gcd(0, 0) == 0
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}
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fn test_lcm() {
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assert math.lcm(2, 3) == 6
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assert math.lcm(-2, 3) == 6
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assert math.lcm(-2, -3) == 6
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assert math.lcm(0, 0) == 0
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}
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