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#include <fstream>
#include <stdio.h>
using namespace std;
//FILE* F(fopen("euclid2.in", "r"));
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");
int euclid( int a , int b)
{
if(b==0)
return a;
else
return euclid (b,a%b);
}
int main()
{
int a , b , t;
fin>>t;
for(int i=1;i<=t;i++)
{
fin>>a>>b;
fout<< euclid(a,b)<<endl;
}
return 0;
}