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#include <fstream>
using namespace std;
int cmmdc(int a, int b){
if (b == 0)
return a;
return cmmdc(b, a % b);
}
int main(){
ifstream fIn("euclid2.in");
ofstream fOut("euclid2.out");
int T, a, b;
fIn >> T;
for (int i = 1; i <= T; i++){
fIn >> a >> b;
fOut << cmmdc(a, b) << '\n';
}
fIn.close();
fOut.close();
return 0;
}