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#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#include <set>
#include <algorithm>
#include <list>
#include <map>
#include <math.h>
#define NMAX 100001
using namespace std;
ifstream f("nim.in");
ofstream g("nim.out");
int main() {
int n;
f>>n;
while(n--)
{
int x;
f>>x;
int suma = 0 ;
for(int i=1;i<=x;i++)
{
int nr;
f>>nr;
suma= suma ^ nr;
}
if(suma)g<<"DA";
else g<<"NU";
}
return 0;
}