//                                                                                                          saan_nitd
//                                                                                                          NIT-DGP
//                                                                                                         IT(2014-2018)
#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int(i)= int(a) ;i<=int(b);i++) // iterator start
#define rev(i,a,b) for(int(i)= int(a);i>=int(b);i--) // iterator end

#define scll(x) scanf("%I64d",&x);// I/O start
#define sc(x) scanf("%d",&x);
#define prln(x) printf("%I64d\n",x);
#define pr(x) printf("%d\n",x);
#define pr_sp(x) printf("%d ",x);// I/O ends

#define MP(x,y) make_pair(x,y)
#define pb push_back
#define all(x) x.begin(),x.end()
//#deifne endl  "\n"
typedef long long int LL;
typedef long int L;
typedef long double LD;
typedef unsigned long long int ULL;
typedef vector<LL> VLL;
typedef vector<L> VL;
typedef vector<int> VI;
typedef vector<char> VC;
typedef vector<string> VS;
typedef vector<float> VF;
typedef vector<double> VD;
typedef pair<LL,LL> PLL;

#define M 1000000007
#define INF 100000000000000
#define pi  3.14159265358979323
                                     // Fuctions start
int  gcd( int  a,int b){ if(a==0) return b;
                    else{ return gcd(b%a,a);}
}//                                                                                                          saan_nitd
//                                                                                                          NIT-DGP
//                                                                                                         IT(2014-2018)
#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int(i)= int(a) ;i<=int(b);i++) // iterator start
#define rev(i,a,b) for(int(i)= int(a);i>=int(b);i--) // iterator end

#define scll(x) scanf("%I64d",&x);// I/O start
#define sc(x) scanf("%d",&x);
#define prln(x) printf("%I64d\n",x);
#define pr(x) printf("%d\n",x);
#define pr_sp(x) printf("%d ",x);
#define coutp(a,b) cout<<fixed<<setprecision(b)<<a
// I/O ends

#define MP(x,y) make_pair(x,y)
#define pb push_back
#define all(x) x.begin(),x.end()
//#deifne endl  "\n"
typedef long long int LL;
typedef long int L;
typedef long double LD;
typedef unsigned long long int ULL;
typedef vector<LL> VLL;
typedef vector<L> VL;
typedef vector<int> VI;
typedef vector<char> VC;
typedef vector<string> VS;
typedef vector<float> VF;
typedef vector<double> VD;
typedef pair<LL,LL> PLL;

#define M 1000000007
#define INF 100000000000000
#define pi  3.14159265358979323
struct saan {
    LL  x,y;
};
int main()
{
 std::ios::sync_with_stdio(0);
 int q,n;
 cin>>q;
 while(q--){
     cin>>n;
     struct saan a[1000];
     for(int i=0;i<n;i++) {
         cin>>a[i].x>>a[i].y;
     }
     cout<<"YES\n";
         
     }
 return 0;
}