title: i need to Count through list
body: <p>I have multiple lists and a big list of lists, I want to check if the big list have some of my small lists and count but I don't want redundancy , example:</p>
  
  <pre><code>list1 = [ "A" , "B" , "C" , "D"]
  List2 = ['K' , "l" , "M"]
  
  main_lists = [["A","C","K","L"] , ["B" , "C" , "M"]]
  
  count1 = 0
  count2 = 0
  </code></pre>
  
  <p>what I need is to cont like if I found any item in main list in my two lists I increase a counter
  but not redundant so my output of this case should be 
  count 1 = 2
  count 2 = 2</p>
  
  <p>no important that A and C in the list of my list, just 1 of them will increase the count, what should I do</p>