#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#define eps 1e-8
using namespace std;
struct point{
	double x,y;
};
struct Lin{
	point p1,p2;
}lin[105];
int n;
double xmult(point p1,point p2,point p0){
	return (p1.x-p0.x)*(p2.y-p0.y)-(p2.x-p0.x)*(p1.y-p0.y);
}
bool check(point pt1,point pt2)
{
	if(fabs(pt1.x-pt2.x)<eps&&fabs(pt1.y-pt2.y)<eps)return false;
	for(int i=1;i<=n;i++){
		if(((xmult(lin[i].p1,pt1,pt2))*(xmult(lin[i].p2,pt1,pt2)))>eps)
			return false;
	}
	return true;
}
bool slove()
{
	if(n<=2)return true;
	for(int i=1;i<=n;i++)
		for(int j=1;j<=n;j++){
			if(check(lin[i].p1,lin[j].p1))return true;
			if(check(lin[i].p1,lin[j].p2))return true;
			if(check(lin[i].p2,lin[j].p1))return true;
			if(check(lin[i].p2,lin[j].p1))return true;
		}
		return false;
}
int main()
{
	//freopen("in.txt","r",stdin);
	int t;
	scanf("%d",&t);
	while(t--){
		scanf("%d",&n);
		for(int i=1;i<=n;i++)
			scanf("%lf %lf %lf %lf",&lin[i].p1.x,&lin[i].p1.y,&lin[i].p2.x,&lin[i].p2.y);
		if(slove())printf("Yes!\n");
		else       printf("No!\n");
	}
	return 0;
}