input: def create_simple_blockchain():
      """Build a simple blockchain system in Python.
      >>> create_simple_blockchain()
      ['0', '0', 'Genesis Block', '0000000000000000000000000000000000000000000000000000000000000000']
      """
output:     blockchain = []
      previous_hash = '0'
      for i in range(3):
          if i == 0:
              block = ['0', previous_hash, 'Genesis Block', '0000000000000000000000000000000000000000000000000000000000000000']
          else:
              block = [str(i), previous_hash, f'Block {i}', '0000000000000000000000000000000000000000000000000000000000000000']
          blockchain.append(block)
          previous_hash = block[3]
      return blockchain[0]