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