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#include <stdint.h>
#include <fstream>
#include <stdlib.h>
using namespace std;
int32_t t, a, b;
fstream f1("euclid2.in", ios::in);
fstream f2("euclid2.out", ios::out);
int32_t cmmdc(int32_t a, int32_t b)
{
if(b==0) return a;
else return cmmdc(b, a%b);
}
int main()
{
int32_t i;
f1>>t;
for(i=1; i<=t; i++)
{
f1>>a>>b;
f2<<cmmdc(a, b)<<"\n";
}
}