#include<fstream>
#include<vector>
std::ifstream fin("nivele.in");
std::ofstream fout("nivele.out");
std::vector<int>v;
inline void solve()
{
    int n;
    fin>>n;
    v.resize(n);
    bool changed=true;
    for(int i=0; i<n; ++i)
        fin>>v[i];

    while(changed)
    {
        changed=false;
        for(int i=n-2; i>=0; --i)
            if(v[i]==v[i+1])
            {
                --v[i];
                v.erase(v.begin()+i+1);
                --n;
                changed=true;
            }
    }
    if(n==1 && v[0]==1)
        fout<<"DA\n";
    else
        fout<<"NU\n";
}
int main()
{
    int t;
    fin>>t;
    while(t--)
        solve();
    return 0;
}