input: from typing import Dict, List
  
  def chat_with_state_diagram(states: Dict[str, Dict[str, str]]) -> List[str]:
      """ Simulate a chatbot conversation using a state diagram.
      Each state has a message and a set of replies that transition to other states.
      The conversation starts at 'state0' and continues until a terminal state is reached.
      The terminal state is defined as a state with no replies.
      The function returns a list of all the messages exchanged during the conversation.
      >>> states = {'state0': {'name': 'state0', 'message': 'Hello! How can I help you?', 'replies': {'I need some advice': 'state1'}}, 'state1': {'name': 'state1', 'message': 'Sure, what kind of advice do you need?', 'replies': {}}}
      >>> chat_with_state_diagram(states) == ['Hello! How can I help you?', 'I need some advice', 'Sure, what kind of advice do you need?']
      """
output:     current_state = 'state0'
      conversation = []
      
      while states[current_state].get('replies'):
          conversation.append(states[current_state]['message'])
          reply = list(states[current_state]['replies'].keys())[0]
          conversation.append(reply)
          current_state = states[current_state]['replies'][reply]
      
      conversation.append(states[current_state]['message'])
      return conversation