I agree with you. I think the presence of START is accidental and is not supposed to be part of the script. The ELIZA code uses a Slip function called LISTRD to read the script rules one by one. If it reads an empty list it stops reading the script and begins the conversation. So I think the empty list at the end of the script had a reason to be there. Another accidental thing about the script in the CACM paper is that there are 6 duplicated lines, each one 34 lines from the previous one. I had not heard of Moiré logic. I'm contributing to a book about ELIZA and its legacy. No publisher yet. The editors may be looking for other contributors. I realize this is not much to go on, but say if it might be of interest to you.