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