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#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int euclid(int a, int b) {
if (!b)
return a;
return euclid(b, a % b);
}
/*int prime(int a, int b) {
if (euclid(a, b) == 1)
return 0;
else
return euclid(a, b);
}*/
int main() {
int T, a, b;
fin >> T;
for (int i = 0; i < T; i++) {
fin >> a >> b;
fout << euclid(a, b) << endl;
}
}