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