#include <bits/stdc++.h>
using namespace std;
vector<string> vec_splitter(string s) {
  s += ',';
  vector<string> res;
  while (!s.empty()) {
    res.push_back(s.substr(0, s.find(',')));
    s = s.substr(s.find(',') + 1);
  }
  return res;
}
void debug_out(vector<string> __attribute__((unused)) args,
               __attribute__((unused)) int idx,
               __attribute__((unused)) int LINE_NUM) {
  cerr << endl;
}
template <typename Head, typename... Tail>
void debug_out(vector<string> args, int idx, int LINE_NUM, Head H, Tail... T) {
  if (idx > 0)
    cerr << ", ";
  else
    cerr << "Line(" << LINE_NUM << ") ";
  stringstream ss;
  ss << H;
  cerr << args[idx] << " = " << ss.str();
  debug_out(args, idx + 1, LINE_NUM, T...);
}
const int MOD = 1e9 + 7;
const long long INF = 1e18;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int T;
  cin >> T;
  while (T--) {
    int n, m, a, b;
    cin >> n >> m >> a >> b;
    if (a * n != m * b) {
      cout << "NO\n";
      continue;
    }
    cout << "YES\n";
    int second = 1;
    while (second * n % m != 0) second++;
    for (int i = 0; i < n; i++) {
      string r = "";
      for (int j = 0; j < m; j++) {
        r += '0';
      }
      for (int j = 0; j < a; j++) {
        r[(second * i + j) % m] = '1';
      }
      cout << r << '\n';
      ;
    }
  }
}
