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