#include <bits/stdc++.h>

using namespace std;

void solve(){
    int n; cin >> n;
    string s; cin >> s;
    int cw = 0, fr = 500;
    for (int i = 0; i < n; i++)
    {
        cw += s[i] == 'W';
        if(s[i] == 'R'){
            fr = min(fr, i);
        }
    }
    
    if(cw % 2 != 0 or cw / 2 > fr){
        cout << "NO\n";
        return;
    }
    int cw2 = 0;
    int wlast = 0;
    for (int i=n; i<2*n; ++i) {
        cw2 += s[i] == 'W';
        if (s[i] == 'W') {
            wlast = i;
        }
    }
    if (cw/2 + cw2 > n) {
        cout << "NO\n";
        return;
    }
    if (cw/2 + cw2 + 2*n - 1 - wlast < n) {
        cout << "NO\n";
        return;
    }
    cout << "YES\n";
    return;
}

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