#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pii;
typedef vector<pii> vii;
typedef vector<string> vs;

#define INF 1e9
#define EPS 1e-9
#define MOD 1000000007

int main()
{
	int t;
	scanf("%d", &t);
	while (t--) {
		int n, m, x, k;
		scanf("%d %d %d %d", &n, &m, &x, &k);
		char s[k+1];
		scanf("%s", s);
		if (k < n) {
			printf("no\n");
		} else {
			int ec = 0, oc = 0;
			for (int i = 0; i < k; i++) {
				if (s[i] == 'E') ec++;
				else if (s[i] == 'O') oc++;
			}
			for (int i = 1; i <= m; i++) {
				if (n <= 0 || ec == 0 && oc == 0) break;
				if (i%2 == 0) {
					if (ec-x >= 0) {
						n -= x;
						ec -= x;
					}
					else {
						n -= ec;
						ec = 0;
					}
				} else {
					if (oc-x >= 0) {
						n -= x;
						oc -= x;
					}
					else {
						n -= oc;
						oc = 0;
					}
				}
			}
			printf("%s\n", n<=0?"yes":"no");
		}
	}
	return 0;
}