input: Write a python function to find the k most frequent elements in a list of strings using the Counter class from the collections module.
  assert most_frequent_elements(["Cat", "Dog", "Bird", "Bird", "Bird", "Fish"], 3) == [('Bird', 3), ('Cat', 1), ('Dog', 1)]
  assert most_frequent_elements(["Apple", "Banana", "Apple", "Orange", "Banana", "Apple"], 2) == [('Apple', 3), ('Banana', 2)]
  assert most_frequent_elements(["Red", "Blue", "Red", "Green", "Blue", "Red", "Yellow"], 1) == [('Red', 3)]
output: def most_frequent_elements(strings, k):
      from collections import Counter
      counter = Counter(strings)
      return counter.most_common(k)