import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int t = Integer.parseInt(br.readLine());
		PrintWriter pw = new PrintWriter(System.out);
		for (int z = 0; z < t; z++) {
			int n = Integer.parseInt(br.readLine());
			String[] sa = br.readLine().split(" ");
			int[] a = new int[n];
			for (int i = 0; i < n; i++) {
				a[i] = Integer.parseInt(sa[i]);
			}

			if (a[0] != a[n - 1]) {
				pw.println("Yes");
				continue;
			}

			boolean flg = false;
			for (int i = 2; i < n - 1; i++) {
				if (a[i - 1] == a[i] && a[0] != a[i]) {
					flg = true;
					break;
				}
			}
			if (flg) {
				pw.println("Yes");
			} else {
				pw.println("No");
			}
		}
		pw.flush();
		br.close();
	}
}