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