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package Greatest_Common_Divisor
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is
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--# function Gcd(A, B: Natural) return Natural;
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procedure G_C_D(M, N: in Natural; G: out Natural);
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--# derives G from M, N;
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--# pre M >= 0 and N > 0;
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--# post G = Gcd(M,N);
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end Greatest_Common_Divisor;
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