#include <bits/stdc++.h>
using namespace std;
int a[25][25], n, m;
bool check() {
  for (int i = 1; i <= n; i++) {
    int cnt = 0;
    for (int j = 1; j <= m; j++)
      if (a[i][j] != j) cnt++;
    if (cnt > 2) return false;
  }
  return true;
}
int main() {
  cin >> n >> m;
  for (int i = 1; i <= n; i++)
    for (int j = 1; j <= m; j++) cin >> a[i][j];
  if (check())
    cout << "YES";
  else {
    for (int i = 1; i < m; i++)
      for (int j = i + 1; j <= m; j++) {
        for (int k = 1; k <= n; k++) {
          swap(a[k][i], a[k][j]);
        }
        if (check()) {
          cout << "YES" << endl;
          return 0;
        }
        for (int k = 1; k <= n; k++) swap(a[k][i], a[k][j]);
      }
    cout << "NO";
  }
  return 0;
}
