input: from typing import List
  
  def generateMarkov(text: str) -> str:
      """Generates a Markov chain based on the input text and produces a randomly generated text based on the chain.
      >>> generateMarkov('Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, `and what is the use of a book,' thought Alice `without pictures or conversation?')
      'convolution and of having nothing to do tired of sitting by her sister on the bank Alice was beginning to get tired of sitting by her sister on the bank what is the use of a \\\n\nthought Alice what is the use of a book what is the use of a book what is the use of a book started Alice very tired of sitting by her sister on the bank and having\\ \nAlice was beginning to get very tired of sitting by her sister on the bank and of having nothing to do tired of sitting by her sister was beginning reading what is the use\\\nof a book what is the use of a book Alice very tired of sitting by her sister',
      """
output:     
      import random
      from collections import defaultdict
  
      words = text.split()
      markov_chain = defaultdict(list)
  
      for i in range(len(words) - 1):
          markov_chain[words[i]].append(words[i + 1])
  
      start_word = random.choice(words)
      result = [start_word]
  
      for _ in range(len(words) * 2):
          if start_word in markov_chain:
              next_word = random.choice(markov_chain[start_word])
              result.append(next_word)
              start_word = next_word
          else:
              break
  
      return ' '.join(result)
  