#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;
        loop(i, 0, n){
            if(taken.find(i) != taken.end()){
                continue;
            }
            bool found = false;
            if(s[i] == 'W'){
                loop(j, i+1, n){
                    if(s[j] == 'W' && taken.find(j) == taken.end()) {
                        taken.insert(i);
                        taken.insert(j);
                        found = true;
                        break;
                    }
                }
            }
            else{
                loop(j, n, 2*n) {
                    if (s[j] == 'W' && taken.find(j) == taken.end()) {
                        taken.insert(i);
                        taken.insert(j);
                        found = true;
                        break;
                    }
                }
            }
            if(!found){
                good = false;
                break;
            }
        }
        if(good){
            cout << "YES" << endl;
        } else {
            cout << "NO" << endl;
        }
    }
    return 0;
}