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