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

void solve() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int cnt1 = 0;
    for (int i = 0; i < n; ++i) {
        if (s[i] == 'W')
            cnt1++;
    }
    if (cnt1 % 2 == 0) {
        cout << "YES\n";
    } else {
        cout << "NO\n";
    }
}
signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int t;
    cin >> t;
    while (t--)
        solve();
}