input: Write a python function to count the frequencies of strings in a list.
  assert count_frequencies(["apple", "banana", "apple", "orange", "banana", "apple"]) == [("apple", 3), ("banana", 2), ("orange", 1)]
  assert count_frequencies(["cat", "dog", "cat", "cat", "dog", "mouse"]) == [("cat", 3), ("dog", 2), ("mouse", 1)]
  assert count_frequencies(["a", "b", "a", "a", "b", "c"]) == [("a", 3), ("b", 2), ("c", 1)]
output: def count_frequencies(strings):
      from collections import Counter
      counter = Counter(strings)
      return list(counter.items())