using namespace std;
#include <bits/stdc++.h>

#define rep(i,a,b) for(int i = a; i < b; i++)
typedef long long ll;


void solve() {
    int n; cin >> n;
    string s;
    cin >> s;
    n *= 2;
    vector<int> arr(n);
    rep(i,0,n) arr[i] = (s[i]=='W');

    bool yes = true;

    int cnt = 0;
    rep(i,0,n/2) cnt += arr[i];

    if (cnt % 2 == 1) yes = 0;

    rep(i,0,cnt/2) if (arr[i] != 1) yes = 0;


    if (yes) cout << "YES\n";
    else cout << "NO\n";
}


int main() {
    int t; cin >> t; while (t--) solve();
}