#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int q;
    cin>>q;
    //cout<<"lol"<<"  "<<q;
    for(int z=0;z<q;z++)
    {
        //cout<<"lol";
        int iq;
        cin>>iq;
                
        int len = iq+iq;
        float a[len];
        //cout<<"lol";
        for(int i=0;i<len;i++)
        {
            cin>>a[i];
            //cout<<"lol";    
        }
        //cout<<"\n\n";
        //cout<<"lol";
        float x,y,x1,y1,x2,y2;
        float m1,m2,m;
        for(int i=0;i<iq-2;i+=2)
        {
           // cout<<"lol";
            x = a[i];
            y = a[i+1];
            x1 = a[i+2];
            y1 = a[i+3];
            x2 = a[i+4];
            y2 = a[i+5];
            //cout<<x<<" "<<y<<" "<<x1<<" "<<y1<<" "<<x2<<" "<<y2<<"\n";
            double d,e,f,g;
            d = y1 - y;
            e = y2 - y;
            f = x1 - x;
            g = x2 - x;
            cout<<d<<"  "<<e<<"  "<<f<<"  "<<g<<"\n";
            if( d==0 )
                d = 1;
            else if(e==0)
                e = 1;
            else if(f==0)
                f = 1;
            else if(g == 0)
                g = 1
            else
                i = i;
                
            m1 = (d)*(e);
            m2 = (f)*(g);
            m = m1 / m2;
            cout<<m1<<"  "<<m2<<"  "<<m<<"\n";
            if( m == -1)
                cout<<"YES\n";
            else
                cout<<"NO\n";   
        }
    }
    return 0;
}