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#include<iostream>
#include<fstream>
#include<math.h>
using namespace std;
ifstream f;
ofstream g;
long int m,n,i,j,mn;
long int euclid(int i,int j)
{
if(j==0||i==0)return abs(i-j);
else
if(i>j)return euclid(i-j,j);
else
return euclid(i,j-i);
}
int main()
{
f.open("euclid2.in");
g.open("euclid2.out");
f>>n;
while(n>0)
{
n--;
f>>i>>j;
g<<euclid(i,j)<<endl;
}
f.close();
g.close();
return 0;
}