maybe it's just me, but it looks like if you search for threads written by TonyC containing "paper" in both title and body, over the last 2 year, you get this thread:
https://nuclearphynance.com/Show%20Post.aspx?PostIDKey=144508
title: Hedging Spread Options
while if you search for "Spread", you do not get it.
i'll just mention it in case it helps