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#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int main()
{
ios_base::sync_with_stdio(false);
fin.tie(NULL);
fout.tie(NULL);
int T{}, a{}, b{}, r{};
fin >> T;
for(int i = 0; i < T; ++i)
{
fin >> a >> b;
while(b)
{
r = a % b;
a = b;
b = r;
}
fout << a << '\n';
}
fin.close();
fout.close();
return 0;
}