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#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a, int b);
int T, x, y;
int main()
{
fin >> T;
for ( int i = 0; i < T; ++i )
{
fin >> x >> y;
fout << cmmdc( x , y ) << '\n';
}
fin.close();
fout.close();
return 0;
}
int cmmdc(int a, int b)
{
if (!b) return a;
return cmmdc( b, a % b );
}