#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll MOD = 1000000007;
using P = pair<int,int>;
#define rep(i, n) for(int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()

int main(){
    int t;
    cin >> t;
    rep(i,t){
        int n;
        bool ans = true;
        cin >> n;
        vector<int> a(2*n);
        vector<vector<int>> ad(n);
        rep(j,2*n){
            cin >> a[j];
            ad[a[j]-1].push_back(j);
            if(ad[a[j]-1].size()>2) ans = false;
        }
        rep(j,n){
            if(ad[j][1] - ad[j][0] == 1) ans = false;
        }
        if(ans) cout << "Yes" << endl;
        else cout << "No" << endl;
    }
    return 0;
}