code: def _intersection(A,B):
      
      intersection = []
      for i in A:
          if i in B:
              intersection.append(i)
      return intersection
docs: A simple function to find an intersection between two arrays. 
      
      @type A: List 
      @param A: First List
      
      @type B: List
      @param B: Second List
      
      @rtype: List
      @return: List of Intersections