#include <iostream>
using namespace std;
int d;
long int a,b;
int main()
{
cin >> d;
for (int i=1;i<=d;i++)
{
cin >> a >> b;
for (int j=a+1;j<b;j++)
{
if (j%2==0) {cout<<j<<' ';}
}
cout << endl;
}
return 0;
}
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