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