#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {
    int t;
    scanf("%d",&t);
    while(t--)
        {
        int n,i;
        scanf("%d",&n);
        int a[n],b[n];
        for(i=0;i<n;i++)
            {
            scanf("%d%d",&a[i],&b[i]);
        }
        if(a[2]==b[3] && a[3]==b[2] || a[3]==a[1] || a[3]==a[2] && b[3]==b[2] || b[3]==b[1])
            printf("YES\n");
        else
            printf("NO\n"); 
    }
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}