#include <bits/stdc++.h>
#define maxN 50005
using namespace std;
int n,i,T,v[maxN];
int stk[maxN],top;
int main()
{
    freopen("nivele.in","r",stdin);
    freopen("nivele.out","w",stdout);
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&n);
        top=0;
        for(i=1;i<=n;i++)
        {
            scanf("%d",&v[i]);
            while(top>0 && v[i]==stk[top] && v[i]>1)
                top--,v[i]--;
            stk[++top]=v[i];
        }
        if(top==1 && stk[top]==1)
            printf("DA\n");
        else printf("NU\n");
    }
    return 0;
}