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

using ll = long long;
#define int ll
using pii = pair<int, int>;

void solve() {
    int n;
    cin>>n;
    string s;
    cin>>s;
    int k = 0;
    vector<int> us(2*n);
    int k1 = 0, k2 = 0;
    for(int i = 0; i < n; i++)
    {
        if(s[i] == 'R') break;
        k1++;
    }
    int K = k1;
    for(int i = k1; i < n; i++)
    {
        if(s[i] == 'W') 
        k1--;
        else k2++;
    }
    if(k1 != 0 || K * 2+ k2 != n)
    cout<<"NO"<<'\n';
    else cout<<"YES"<<'\n';
}

int32_t main() {
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);

    int tt = 1;
    cin >> tt;
    for (int t = 0; t < tt; t++) {
        solve();
    }
    return 0;
}