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