input: Write a python function to find the mode of a list of numbers using the collections module.
  assert mode([1, 2, 3, 2, 4, 2]) == [2]
  assert mode([5, 5, 6, 7, 8, 8, 9, 9]) == [5, 8, 9]
  assert mode([1, 1, 2, 2, 3, 3, 4, 4]) == [1, 2, 3, 4]
output: def mode(numbers):
      from collections import Counter
      count = Counter(numbers)
      max_freq = max(count.values())
      return [num for num, freq in count.items() if freq == max_freq]