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#include <iostream>
#include <fstream>
//Algoritmul lui Euclid
using namespace std;
ifstream f ("euclid2.in");
ofstream g ("euclid2.out");
int cmmdc(int a, int b){
if(a==0){
g<<b<<endl;
}
while(b!=0){
if(a>b){
a = a - b;
}else{
b = b - a;
}
}
g<<a<<endl;
}
int main()
{
int a,b;
int i,T;
f>>T;
for(i=1; i<=T; i++){
f>>a>>b;
cmmdc(a,b);
}
f.close();
g.close();
return 0;
}