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#include <stdlib.h>
#include <vector>
#include <string>
#include <iostream>
#include <limits>
#include <fstream>
using namespace std;
int gcd(int a, int b)
{
if (!b) return a;
return gcd(b, a % b);
}
int A,B;
int main(int argc, char** argv){
ifstream in; in.open("euclid2.in");
ofstream out; out.open("euclid2.out");
int T; in >> T;
for (int i=0; i<T; i++){
in>>A>>B;
out<<gcd(A,B)<<endl;
}
}