import sys
input = lambda : sys.stdin.readline().rstrip()

write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))
# sys.setrecursionlimit(3*10**5+10)
def sub(a):
    t = [[] for _ in range(n+1)]
    for i in range(2*n):
        v = a[i]
        l = []
        if i>0:
            l.append(a[i-1])
        if i+1<2*n:
            l.append(a[i+1])
        t[v].extend(l)
    for i in range(n+1):
        t[i] = tuple(sorted(t[i]))
    return [set(item) for item in t]
t = int(input())
for _ in range(t):
    n = int(input())
    a = list(map(int, input().split()))
    s1 = sub(a)
    s2 = sub(list(range(1,n+1)) + list(range(1,n+1)))
#     print(s1,s2)
    if all((s1[i]==s2[i] for i in range(n+1))):
        print("Yes")
    else:
        print("No")