#include <bits/stdc++.h>
#define NMAX 405

using namespace std;

map < pair < double , double> , int > Map;

ifstream fin("plagiat.in");
ofstream fout("plagiat.out");

struct point {
    int x,y;
}V[NMAX];

int main()
{
    ios :: sync_with_stdio(false);
    fin.tie(NULL);

    int T,n,i,j;
    double d,u,x,y;
    fin >> T;
    while(T--){
        fin >> n;
        for(int i = 1; i <= n; i++)
            fin >> V[i].x >> V[i].y;

        for(i = 1; i <= n; i++)
            for(j = i; j <= n; j++){
                d = sqrt((V[i].x - V[j].x)*(V[i].x - V[j].x) + (V[i].y - V[j].y)*(V[i].y - V[j].y));
                u = atan2(V[i].y - V[j].y,V[i].x - V[j].x);
                Map[{d,u}] ++;
                //fout << V[i].x << " " << V[i].y << "\n";
                if(Map[{d,u}] == 3){
                    fout << "DA" << "\n";
                    fout << d << " " << u << "\n";
                    i = n + 2;
                    j = n + 2;
                }
            }
        if(i != n + 3)
            fout << "NU" << "\n";
        Map.clear();
    }

    return 0;
}