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#include <iostream>
#include <fstream>
using namespace std;
int euclid(int a, int b)
{
if(a==b)
return a;
else
if(a>b)
return euclid(a-b,b);
else
return euclid(a,b-a);
}
int euclid2(int a, int b)
{
if(b==0)
return a;
else
return euclid2(b,a%b);
}
int main()
{
ifstream f("euclid2.in");
ofstream g("euclid2.out");
long t,a,b;
f>>t;
for(int i=1;i<=t;i++)
{
f>>a>>b;
g<<euclid2(a,b)<<endl;
}
}