#include <bits/stdc++.h>
bool local = false;
using namespace std;
template <class T>
string toString(T x) {
  ostringstream sout;
  sout << x;
  return sout.str();
}
template <class T>
void print(T v) {
  cout << ((int)(v).size()) << "\n";
  for (auto x : v) cout << x << ' ';
  cout << "\n";
};
template <class T>
void print1(T v) {
  cout << ((int)(v).size()) << "\n";
  for (auto x : v) cout << x + 1 << ' ';
  cout << "\n";
};
template <class T1, class T2>
ostream &operator<<(ostream &o, pair<T1, T2> x) {
  return o << x.first << ' ' << x.second;
}
template <class T1, class T2>
istream &operator>>(istream &o, pair<T1, T2> &x) {
  return o >> x.first >> x.second;
}
template <class T1, class T2>
pair<T1, T2> operator+(pair<T1, T2> a, pair<T1, T2> b) {
  a.first += b.first;
  a.second += b.second;
  return a;
}
template <class T1, class T2>
pair<T1, T2> operator-(pair<T1, T2> a, pair<T1, T2> b) {
  a.first -= b.first;
  a.second -= b.second;
  return a;
}
template <class T1, class T2>
void operator+=(pair<T1, T2> &a, pair<T1, T2> b) {
  a.first += b.first;
  a.second += b.second;
}
template <class T1, class T2>
void operator-=(pair<T1, T2> &a, pair<T1, T2> b) {
  a.first -= b.first;
  a.second -= b.second;
}
int nint() {
  int x;
  cin >> x;
  return x;
}
double getTime() { return clock() / (double)CLOCKS_PER_SEC; };
mt19937 rnd(0);
int rand(int n) { return rnd() % n; }
int rand(int l, int r) { return rnd() % (r - l + 1) + l; }
const int mod = 1000000000 + 7;
void initIO() {
  if (local) {
    freopen("input.txt", "r", stdin);
    srand((int)time(0));
    rnd.seed((int)time(0));
  } else {
  }
  {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
  };
}
void solve();
int main() {
  initIO();
  int tc = 1;
  cin >> tc;
  for (int tt = 0; tt < (tc); tt++) {
    solve();
  }
  if (local)
    cout << "\n"
         << "time = " << getTime() << "\n";
}
int n;
int m;
int a, b;
int check(vector<int> v) {
  int c1 = 0;
  vector<int> v2;
  for (int x : v) {
    if (x < b) continue;
    if (x >= b && x < a) return 0;
    if (x >= 2 * b) v2.emplace_back(x);
    if (x < 2 * b) c1++;
  }
  if (((int)(v2).size()) >= 2) return 0;
  if (((int)(v2).size()) == 0) return c1 % 2 == 1;
  int z = v2[0];
  for (int o = 0; o + a <= z; o++) {
    int a1 = o;
    int a2 = z - o - a;
    if (a1 >= 2 * b || a2 >= 2 * b) continue;
    if (a1 >= b && a1 < a) continue;
    if (a2 >= b && a2 < a) continue;
    int k = c1 + (a1 >= b) + (a2 >= b);
    if (k % 2 == 0) return 1;
  }
  return 0;
}
void solve() {
  string s;
  cin >> a >> b;
  cin >> s;
  replace(s.begin(), s.end(), 'X', ' ');
  stringstream sin(s);
  vector<int> v;
  string tmp;
  while (sin >> tmp) v.emplace_back(((int)(tmp).size()));
  if (check(v))
    cout << "YES"
         << "\n";
  else
    cout << "NO"
         << "\n";
}
