title: Python - Remove a set of a list from another list
body: <pre><code>array1 = [1, 2, 3, 4, 5, 6, 7, 8, 9]
  array2 = [1, 2, 2, 2, 5, 6, 6, 6, 9]
  
  temp = set(array2)
  
  array1.remove(temp)
  
  Traceback (most recent call last):
    File "Sudoku V2.py", line 6, in &lt;module&gt;
      array1.remove(temp)
  ValueError: list.remove(x): x not in list
  </code></pre>