def f():
    N = int(input())
    A = list(map(int,input().split()))
    pre = -1
    start = -1
    d = {x:0 for x in range(1,N+1)}
    if A[0]!=1:return 'No'

    for i in range(2*N):
        d[A[i]]+=1
        if d[A[i]]>2:return 'No'

        x = (i+1)%N if (i+1)%N!=0 else N
        if pre==-1 and A[i]!=x:
            start = A[i-1]
            pre = A[i]
        elif pre>0:
            if start==A[i]:pre=-1;continue
            if pre!=A[i]+1:return 'No'
            pre = A[i]
    return 'Yes'

T = int(input())
for i in range(T):print(f())