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def gcd(a, b):
"""Returns the Greatest Common Divisor of the two integers
passed as arguments.
Args:
a: an integer
b: another integer
Returns: Greatest Common Divisor of a and b
>>> gcd(48, 64)
16
>>> gcd(44, 19)
1
"""
if b == 0:
return b
return gcd(b, a%b)
if __name__ == "__main__":
import doctest
doctest.testmod()
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