#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long tests;
  cin >> tests;
  while (tests-- > 0) {
    long long n, m;
    cin >> n >> m;
    vector<vector<long long> > mat(n, vector<long long>(m));
    for (long long i = 0; i < n; i++) {
      for (long long j = 0; j < m; j++) {
        char ch;
        cin >> ch;
        mat[i][j] = ch - '0';
      }
    }
    vector<tuple<long long, long long, long long, long long, long long,
                 long long> >
        ans;
    auto change = [&](long long a, long long b, long long c, long long d,
                      long long e, long long f) {
      ans.emplace_back(a, b, c, d, e, f);
      mat[a][b] ^= 1;
      mat[c][d] ^= 1;
      mat[e][f] ^= 1;
    };
    for (long long i = n - 1; i >= 2; i--) {
      for (long long j = 0; j < m; j++) {
        if (mat[i][j]) {
          if (j)
            change(i, j, i - 1, j, i - 1, j - 1);
          else
            change(i, j, i - 1, j, i - 1, j + 1);
        }
      }
    }
    for (long long i = m - 1; i >= 2; i--) {
      if (mat[0][i]) change(0, i, 0, i - 1, 1, i - 1);
      if (mat[1][i]) change(1, i, 0, i - 1, 1, i - 1);
    }
    if (mat[1][1]) change(0, 1, 1, 0, 1, 1);
    if (mat[0][0] + mat[0][1] + mat[1][0] == 3) {
      change(0, 0, 0, 1, 1, 0);
    } else if (mat[0][0] + mat[0][1] == 2) {
      change(0, 0, 1, 0, 1, 1);
      change(0, 1, 1, 0, 1, 1);
    } else if (mat[0][0] + mat[1][0] == 2) {
      change(0, 0, 0, 1, 1, 1);
      change(1, 0, 0, 1, 1, 1);
    } else if (mat[1][0] + mat[0][1] == 2) {
      change(1, 0, 0, 0, 1, 1);
      change(0, 1, 0, 0, 1, 1);
    } else if (mat[0][0] == 1) {
      change(0, 0, 0, 1, 1, 0);
      change(0, 0, 0, 1, 1, 1);
      change(0, 0, 1, 1, 1, 0);
    } else if (mat[0][1] == 1) {
      change(0, 1, 0, 0, 1, 1);
      change(0, 1, 0, 0, 1, 0);
      change(0, 1, 1, 0, 1, 1);
    } else if (mat[1][0] == 1) {
      change(1, 0, 1, 1, 0, 0);
      change(1, 0, 1, 1, 0, 1);
      change(1, 0, 0, 1, 0, 0);
    }
    cout << ans.size() << '\n';
    for (auto [a, b, c, d, e, f] : ans) {
      cout << a + 1 << " " << b + 1 << " " << c + 1 << " " << d + 1 << " "
           << e + 1 << " " << f + 1 << '\n';
    }
  }
  return 0;
}
