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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
int gcd( int a , int b ){
while ( b ){
int aux = b ;
b = a % b ;
a = aux ;
}
return a ;
}
int main()
{
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int a , b , n ;
f >> n ;
for( int i = 0 ; i < n ; i++ )
f >> a >> b ,
g << __gcd( a , b ) << '\n' ;
return 0;
}