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#include <iostream>
#include <fstream>
using namespace std;
long long cmmdc(long long a , long long b){
long long temp;
while( b != 0 ){
temp = a % b;
a = b;
b = temp;}
return a;
}
int main()
{
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int numarperechi;
f>>numarperechi;
for(int i=0; i<numarperechi; i++){
long long a,b;
f>>a>>b;
g<<cmmdc(a,b)<<endl;
}
return 0;
}