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#include<fstream>
using namespace std;
ifstream fin ("nim.in" );
ofstream fout("nim.out");
int N, Q, i, j, X, xorsum;
void CodeExpert(){
fin >> Q;
for(Q = Q; Q >= 1; Q --){
fin >> N;
xorsum = 0;
for(j = 1; j <= N; j ++){
fin >> X;
xorsum = (xorsum ^ X);
}
if(xorsum != 0)
fout << "DA\n";
else
fout << "NU\n";
}
return;
}
int main(){
CodeExpert();
return 0;
}