T = int(input())

for _ in range(T):
    N = int(input())
    l = list(map(int,input().split()))
    F = 1
    if l[0] != 1 or l[-1] != N:
        F = 0
    L = [0 for i in range(N+1)]
    L[0] = 2
    for i in range(2*N):
        if l[i] > N:
            F = 0
        else:
            L[l[i]] += 1
    if min(L) != 2:
        F = 0
    if F:
        print("Yes")
    else:
        print("No")