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#include <iostream>
#include <cstdio>
#include <climits>
#include <climits>
#include <vector>
#include <assert.h>
#define MAXN 20
#define maxim 10000000
using namespace std;
int main()
{
freopen("nim.in", "r", stdin);
freopen("nim.out", "w", stdout);
int n, x, y; cin >> n;
int xorsum;
for(int i = 0; i < n; i++)
{
scanf("%d", &x);
xorsum = 0;
for(int j = 0; j < x; j++)
{
scanf("%d", &y);
xorsum ^= y;
}
if(xorsum) printf("DA\n");
else printf("NU\n");
}
}