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#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int euclid(int a, int b)
{
int aux;
while(b!=0)
{
aux=b;
b=a%b;
a=aux;
}
return a;
}
int euclid2(int a, int b)
{
while(a!=b)
{
if(a>b)
a=a-b;
else
b=b-a;
}
return a;
}
int euclid3(int a, int b)
{
if(b==0)
return a;
else
return euclid3(b,a%b);
}
int main()
{
int n,a,b;
fin>>n;
for(int i=1;i<=n;i++)
{
fin>>a>>b;
fout<<euclid3(a,b)<<endl;
}
return 0;
}