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

void solve() {
    string s;
    int n;
    cin >> n;
    cin >> s;

    int cnt = 0, pf = 0;
    for (int i = 0; i < n; ++i) {
        if (s[i] == 'W') {
            ++pf;
        } else {
            break;
        }
    }

    for (int i = 0; i < n; ++i) {
        if (s[i] == 'W')
 {
        ++cnt;
 }    }

    if (cnt % 2 == 0 && pf * 2 >= cnt)
        cout << "YES\n";
    else
        cout << "NO\n";
}

int main() {
    cin.tie(NULL);
    ios::sync_with_stdio(false);
    int t;
    cin >> t;
    while (t--)
        solve();
    return 0;
}