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#include <bits/stdc++.h>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int t;
int euclid(int a, int b) {
if (a == b || a == 0) {
return b;
}
if (a < b) {
swap(a, b);
}
return euclid(a%b, b);
}
int main() {
int a, b;
fin>>t;
for (int i=0; i<t; i++) {
fin>>a>>b;
fout<<euclid(a, b)<<"\n";
}
return 0;
}