// uso
#include <iostream>
#include <vector>
using namespace std;

bool solve() {
    int N;
    cin >> N;
    vector<int> A(N * 2);
    vector<int> acnt(N + 1);
    for (auto &x : A) {
        cin >> x;
        acnt[x]++;
    }

    if (A[0] != 1 or A.back() != N) return false;
    for (auto c : acnt) {
        if (c > 2) return false;
    }
    if (N == 1) return true;
    for (int i = 1; i < int(A.size()); i++) {
        if (A[i - 1] == A[i]) return false;
    }
    return true;
}

int main() {
    cin.tie(nullptr), ios::sync_with_stdio(false);
    int T;
    cin >> T;
    while (T--) cout << (solve() ? "Yes" : "No") << '\n';
}