title: issubset() and difference() list equivalent
body: <p>i need to use issubset() and difference() on lists but i can't translate my list in sets, because my list has duplicates and they are very important.
  For exemple, i have</p>
  <pre><code>list1 = [33, 33, 100, 102,]
  list2 = [33, 33, 33, 33]
  list3 = [99, 100, 101, 102, 103]
  list4 = [100,101,102,103,104]
  </code></pre>
  <p>i need to know that list1 is contained in list2 and that i need [33,33] in order for list1 to be equaled to list2 or that list1 is contained in list3 and list4</p>
  <p>i have tried to do it with multiple 'for loops', but i can't seem to be able to get it right</p>