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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int cmmdc( long long int x, long long int y )
{
if( y == 0 )
return x;
return cmmdc(y, x % y);
}
int main()
{
long long int x, y;
int n;
f>>n;
for( int i = 1; i <= n; i ++ )
{
f>>x>>y;
g<<cmmdc(x,y)<<'\n';
}
f.close();
g.close();
return 0;
}