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#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int a,b,nr;
void gcd (int a,int b)
{ if(a%b==0)
{g<<b<<'\n';
return;
}
if(b%a==0)
{g<<a<<'\n';
return;
}
if(a==b)
{g<<a<<'\n';
return;
}
int r=0;
do
if(a>b)
{
r=a%b;
a=b;
b=r;
}
else
{
r=b%a;
b=a;
a=r;
}
while(r);
g<<b<<'\n';
}
int main()
{
f>>nr;
for(int i=1; i<=nr; i++)
{
f>>a>>b;
gcd(a,b);
}
return 0;
}