#include <bits/stdc++.h>
#define loop(i,s,e) for(int i=s; i<e; i++)
using namespace std;
int solve() {
    int n; cin>>n;
    string s; cin>>s;
    int count = 0;
    loop(i,0,n) count+=(s[i]=='W');
    cout << (count % 2 == 1 ? "NO" : "YES") << endl;
    return 0;
}
int main() {
    ios_base::sync_with_stdio(false);
    int t; cin>>t;
    for(int i=0; i<t; i++) {
        solve();
    }
    return 0;
}