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

typedef vector<int> vi;

#define int int64_t

#define loop(i,s,t) for(int i=s;i<t;i++)
#define all(a) a.begin(),a.end()

typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef long double ld;

int32_t main() {
    ios_base::sync_with_stdio(false); cin.tie(0);
    int t; cin >> t;
    while(t--){
        bool good = true;
        int n; cin >> n;
        string s; cin >> s;
        set<int> taken;
        int first_half_w = 0;
        int pre_w = 0;
        bool seen_r = false;
        loop(i, 0, n){
            if(s[i] == 'W'){
                first_half_w++;
                if(!seen_r){
                    pre_w++;
                }
            }
            else{
                seen_r = true;
            }
        }
        if(pre_w * 2 == first_half_w){
            cout << "YES" << endl;
        } else {
            cout << "NO" << endl;
        }
    }
    return 0;
}