import java.util.Scanner;
 
public class Main {
 
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
 
        int t = scanner.nextInt(); // number of test cases
        while (t-- > 0) {
            int n = scanner.nextInt(); // length of s
            String s = scanner.next(); // binary string s
            String r = scanner.next(); // binary string r
 
            // Check if we can perform the operation by finding adjacent differing bits
            boolean canPerformOperations = false;
 
            // Traverse s and check for adjacent differing bits
            for (int i = 0; i < n - 1; i++) {
                if (s.charAt(i) != s.charAt(i + 1)) {
                    canPerformOperations = true;
                    break;
                }
            }
 
            // If there's at least one adjacent differing pair, we can perform operations
            if (canPerformOperations) {
                System.out.println("YES");
            } else {
                System.out.println("NO");
            }
        }
 
        scanner.close();
    }
}
 

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6
2
11
0
2
01
1
4
1101
001
6
111110
10000
6
010010
11010
8
10010010
0010010