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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int q;
    cin>>q;
    for(int x=0;x<q;x++){
        int n;
        cin>>n;
        int ar[n][2];
        int ar2[n*2];
        int count=0;
        for(int y1=0;y1<(n*2);y1++){
           
               cin>>ar2[y1];
            
        }
        int min1=0,max1=0,min2=0,max2=0;
        for(int c=1;c<(n*2);c++)
            {
            if(ar2[c]<ar2[min1])
                {
                min1=c;
            }
             if(ar2[c]>ar2[max1])
                {
                max1=c;
            }
        }
        max2=ar2[max1];min2=ar2[min1];
         
        int fl=0;
       
        for(int c=0;c<(n*2);c=c+2)
            {
            int h1=ar2[c];
            int h2=ar2[c+1];
            if((h1!=max2 && h1!=min2)){
               if((h2!=max2 && h2!=min2)){
                   cout<<"NO\n";
                   fl=1;
               } 
            }
            else if(h2!=max2 && h2!=min2){
                 if((h1!=max2 && h1!=min2)){
                   cout<<"NO\n";
                     fl=1;
               } 
            }
        
         
        }
        if(fl==0)
            {cout<<"YES\n";}
        
    }
    return 0;
}