using System.Collections.Generic; using System.Linq; using System; public class Hello { static void Main() { var t = int.Parse(Console.ReadLine().Trim()); while (t-- > 0) { var n = int.Parse(Console.ReadLine().Trim()); string[] line = ("0 " + Console.ReadLine().Trim()).Split(' '); var a = Array.ConvertAll(line, int.Parse); getAns(n, a); } } static int[] change(int n, int t) { var a = new int[2 * n + 1]; var b = new int[2 * n + 1]; for (int i = 1; i <= n; i++) { a[i] = i; a[i + n] = i; b[i] = i; b[i + n] = i; } var p = t + n - 1; var imax = p; for (int i = t + 1; i <= imax; i++) a[i] = b[p--]; return a; } static bool check(int n, int[] a, int t) { var b = change(n, t); for (int i = 1; i <= 2 * n; i++) { if (a[i] != b[i]) return false; } return true; } static void getAns(int n, int[] a) { var ok = true; for (int i = 1; i <= n; i++) { if (a[i] != a[i + n]) { ok = false; break; } if (a[i] != i ) { ok = false; break; } } if (ok) { Console.WriteLine("Yes"); return; } var b = new List(); for (int i = 1; i <= n; i++) if (a[i] == a[i + n]) b.Add(i); if (b.Count() == 0) { Console.WriteLine("No"); return; } foreach(var x in b) { if (check(n, a, x)) { Console.WriteLine("Yes"); return; } } Console.WriteLine("No"); } }