import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc = new Scanner(System.in);
        int q = sc.nextInt();
        while(q-- > 0){
            int n = sc.nextInt();
            for(int i=1;i<=n;i++){
                int x = sc.nextInt();
                int y = sc.nextInt();
            }
            System.out.println(n%2 !=0 ?"YES" :"NO");
        }
    }
}