input: Write a python function to find the mode of a list using the Counter class from collections.
  assert mode([6, 2, 8, 9, 3, 2, 10]) == 2
  assert mode([1, 1, 2, 2, 3]) == "No single mode found"
  assert mode([4, 5, 6, 7, 8, 8, 9, 9]) == "No single mode found"
output: from collections import Counter
  
  def mode(lst):
      count = Counter(lst)
      max_freq = max(count.values())
      modes = [k for k, v in count.items() if v == max_freq]
      if len(modes) == 1:
          return modes[0]
      return "No single mode found"