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#include <fstream>
#define ll long long
using namespace std;
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");
ll r,nr,nr1;
int euclid(ll nr,ll nr1)
{
while(nr1!=0)
r=nr%nr1,nr=nr1,nr1=r;
return nr;
}
int main()
{
int n,i;
fin >> n;
for(i=1; i<=n; i++)
{
fin >> nr >> nr1;
euclid(nr,nr1);
fout << endl;
}
fin.close();
fout.close();
return 0;
}