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

void solve() {
    int n;
    cin >> n;
    string s;
    cin >> s;

    int i = 0;
    while(s[i] == 'W') i++;
    int st = i;
    int af = 0;
    for(;i < n; i++) if (s[i] == 'W') af++;
    if (st >= af && (st+af) % 2 == 0) cout << "YES\n";
    else cout << "NO\n";
}
int main() {
    int t;
    cin >> t;
    while(t--) {
        solve();
    }
}