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#include<fstream>
using namespace std;
int euclid(int a, int b){
if (a == 0 || b == 0)
return a + b;
else if (a > b)
return euclid(a%b,b);
else
return euclid(a,b%a);
}
int main(){
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int x, y, n;
f >> n;
for(int i = 1; i <= n; i++){
f >> x >> y;
g << euclid(x,y) << '\n';
}
f.close();
g.close();
}