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#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
#include <deque>
#include <algorithm>
#define ll long long
using namespace std;
ifstream f("nim.in");
ofstream g("nim.out");
int n,i,j,cnt,xorr,x,t;
int main()
{
f>>t;
while(t)
{
f>>n;
xorr=0;
for(i=1;i<=n;i++)
{
f>>x;
xorr^=x;
}
if(xorr>0) g<<"DA\n";
else g<<"NU\n";
t--;
}
return 0;
}