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