q = int(input().strip()) for _ in range(q): t, j, n, pushed, popped = ( [], 0, int(input().strip()), list(map(str, input().strip().split(" "))), list(map(str, input().strip().split(" "))), ) for i in pushed: t.append(i) while t and t[-1] == popped[j]: t.pop() j += 1 print("Y...