#include <bits/stdc++.h>

using namespace std;

ifstream fin("nim.in");

ofstream fout("nim.out");
int n;
int x, y;
int t;
int main()
{
    fin >> t;
    while (t--)
    {
        fin >> n;
        fin >> x;
        if (n == 1)
            fout << "DA\n";
        else
        {
            for (int i = 2; i <= n; i++)
            {
                fin >> y;
                x ^= y;
            }
            if (x != 0)
                fout << "DA\n";
            else
                fout << "NU\n";
        }
    }
}