T = int(input())
for _ in range(T):
  N = int(input())
  A = list(map(int,input().split()))
  count = 0
  for i in range(1,2*N):
    if abs(A[i-1]-A[i]) > 1:
      count += 1
  if count == 1:
    print('Yes')
  else:
    print('No')