#include <iostream>

using namespace std;

int main() {
    ios::sync_with_stdio(false); cin.tie(0);
    int t; cin >> t;
    while (t--) {
        int n; cin >> n;
        string s; cin >> s;
        int cnt = 0, cntPref = 0, cntSuff = 0;
        for (int i = 0; i < n; i++) {
            if (s[i] == 'W') {
                cnt++;
            }
        }
        for (int i = 0; i < n; i++) {
            if (s[i] != 'W') {
                break;
            }
            cntPref = i+1;
        }
        for (int i = 2*n-1; i >= n; i--) {
            if (s[i] == 'W') {
                break;
            }
            cntSuff = 2*n-i;
        }
        if (cnt%2 == 0 && cntPref >= cnt/2 && cntSuff >= cnt/2) {
            cout << "YES\n";
        } else {
            cout << "NO\n";
        }
    }
    return 0;
}

/*
 *
 *
3
4
WRRWWWRR
1
WR
20
WWWWRRWRRRRRWRRWRWRRWRRWWWWWWWRWWRWWRRRR
 */