Sometimes it becomes necessary to differentiate the source of the transition to the chatbot. You can prepare different phrases for different sources. The "label" block will be launched if the text of the message from the subscriber matches the text entered in the block. This does not have to be the first message from the subscriber, which in principle allows the block to be used also to build a more complex navigation system inside the chat -bot.
If the subscriber wrote to the bot and the text of not one label did not match, then control will go to the "entry point" block, which exists in a single instance in the script and cannot be deleted or cloned.