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