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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin ("euclid2.in");
ofstream fout("euclid2.out");
int sol1(int a,int b) {
int minim = min(a, b);
for (int i = minim;i >= 1;i --)
if (a % i == 0 and b % i == 0)
return i;
}
int sol2(int a, int b) {
if (a == b)
return a;
else
if (a > b)
return sol2(a - b, b);
else
return sol2(a, b - a);
}
int main() {
int a, b, t;
fin >> t;
while(t --) {
fin >> a >> b;
fout << sol2(a, b) << '\n';
}
return 0;
}