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

#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define F first
#define S second
#define MP make_pair
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

signed main()
{
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);

	int t;
	cin >> t;

	rep(ttt, 0, t)
	{
		int n;
		cin >> n;

		string s;
		cin >> s;

		int cnt = 0;

		rep(i, 0, n)
		{
			if (s[i] == 'W')
				cnt++;
		}

		if (cnt % 2 == 0)
			cout << "YES\n";
		else
			cout << "NO\n";
	}
}