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#include <iostream>
#include <fstream>
using namespace std;
long long euclid(long long a,long long b)
{
long long t;
while(a)
{
t=a;
a=b%a;
b=t;
}
return b;
}
int main()
{
ifstream f("euclid2.in");
ofstream g("euclid2.out");
long T,i;
long long a,b;
f>>T;
for (i=0;i<T;i++)
{
f>>a>>b;
g<<euclid(a,b)<<'\n';
}
f.close();
g.close();
return 0;
}