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#include <bits/stdc++.h>
using namespace std;
int n, t, x, i, sum;
int main()
{
freopen("nim.in", "r", stdin);
freopen("nim.out", "w", stdout);
scanf("%d", &t);
for(; t; t--)
{
scanf("%d", &n);
sum = 0;
for(i = 1; i <= n; i++)
{
scanf("%d", &x);
sum ^= x;
}
if(sum)
printf("DA\n");
else
printf("NU\n");
}
return 0;
}