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

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

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

    if (cnt % 2) {
        cout << "NO\n";
        return;
    }

    int j = 0;
    int nr = 0;
    while (1) {
        if (s[j] == 'W') {
            ++nr;
            if (nr == cnt / 2 + 1)
                break;
        }
        ++j;
    }

    // cout << j << "\n";
    vector<int> used(2 * n);
    char need = 'W';
    for (int i = 0; i < 2 * n; ++i) {
        if (i >= n)
            need = 'R';
        if (used[i])
            continue;

        if (s[i] == 'W') {
            while (j < 2 * n && s[j] != 'W') {
                ++j;
            }
        } else {
            while (j < 2 * n && s[j] != need) {
                ++j;
            }
        }

        if (j == 2 * n) {
            cout << "NO\n";
            return;
        }

        swap(s[i], s[j]);
        used[j] = 1;
        ++j;
    }

    for (int i = 0; i < n; ++i) {
        if (s[i] == 'R') {
            cout << "NO\n";
            return;
        }
    }

    cout << "YES\n";
}

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