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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
void functie(int a, int b) {
while(a != b) {
if(a > b) {
a -= b;
}
else if(a < b) {
b -= a;
}
}
fout << a << endl;
return;
}
int main()
{
int n, a, b;
fin >> n;
for(int z = 0; z < n; ++z) {
fin >> a >> b;
functie(a, b);
}
return 0;
}
/*void functie(int a, int b) {
if(a > b) {
a -= b;
}
else if(a < b) {
b -= a;
}
else if(a == b) {
cout << a << endl;
}
}*/