#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
using vi = vector<int>;
using vc = vector<char>;
using vb = vector<bool>;
using vs = vector<string>;
using vll = vector<long long>;
using vp = vector<pair<int, int>>;
using vvi = vector<vector<int>>;
using vvc = vector<vector<char>>;
using vvll = vector<vector<long long>>;
template <class T>
inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T>
inline bool chmin(T &a, T b) {
  if (b < a) {
    a = b;
    return 1;
  }
  return 0;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int t;
  cin >> t;
  while (t--) {
    int n, m, a, b;
    cin >> n >> m >> a >> b;
    if (n * a != m * b) {
      cout << "NO" << endl;
      continue;
    }
    vvi ans(n, vi(m, 0));
    for (int i = 0; i < (int)(n); i++) {
      int l = a * i;
      int r = l + a;
      l %= m;
      r %= m;
      bool flag = false;
      if (l >= r) flag = true;
      for (int j = 0; j < (int)(m); j++) {
        if (!flag) {
          if (l <= j && j < r) ans[i][j] = 1;
        } else {
          if (l <= j || j < r) ans[i][j] = 1;
        }
      }
    }
    bool ok = true;
    for (int i = 0; i < (int)(n); i++) {
      int cnt = 0;
      for (int j = 0; j < (int)(m); j++) cnt += ans[i][j];
      if (cnt != a) ok = false;
    }
    for (int j = 0; j < (int)(m); j++) {
      int cnt = 0;
      for (int i = 0; i < (int)(n); i++) cnt += ans[i][j];
      if (cnt != b) ok = false;
    }
    if (!ok) {
      cout << "NO" << endl;
      continue;
    }
    cout << "YES" << endl;
    for (int i = 0; i < (int)(n); i++) {
      for (int j = 0; j < (int)(m); j++) {
        cout << ans[i][j];
      }
      cout << endl;
    }
  }
}
