#include<iostream>
#define ll long long
#include<vector>
#include<stack>
#include<string>
#include<algorithm>
using namespace std;
void solve()
{
ll w, x, y, z, total;
cin >> w >> x >> y >> z;
total = w + (y * z);
if (total == x)
{
cout << "filled
";
}
else if (total > x)
{
cout << "overFlow
";
}
else
{
cout << "Unfilled
";
}
}
int main()
{
int t;
cin >> t;
while (t--)
{
solve();
}
return 0;
}