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#include <bits/stdc++.h>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int n, i, x, y, r, a, b;
int main()
{
fin>>n;
for(i=1; i<=n; i++){
fin>>x>>y;
if(x==0||y==0)fout<<max(y,x)<<endl;
else{
if(max(x,y)%min(x,y)==0)fout<<min(x,y)<<endl;
else{
a=min(x,y);
b=max(x,y);
r=b%a;
while(r!=0){
if(b%a!=0){b=a; a=r; r=b%a;}
}
fout<<a<<endl;
}
}}
return 0;
}