#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
#define all(x) begin(x),end(x)
#define rep(i,a,b) for(int i=(a);i<(b);++i)
#define sz(x) int(x.size())

void solve(){
    int n; cin >> n;
    string s; cin >> s;
    int cnt = 0;
    rep(i,0,n) cnt += s[i] == 'W';

    if (cnt&1){
        cout << "NO\n";
    }
    else{
        cout << "YES\n";
    }
}

int main() {
    cin.tie(NULL);
    cin.sync_with_stdio(false);

    int t; cin >> t;
    while(t--) solve();
}