What are oldest know collections of EBT. For some reason I remember there being two (collections) of them and the Rhinoceros Sutta was included in them. I remember the phase proto-sanskrit/pali being used in describing them. I really don’t have more to go off of from what I remember. I’ve lost a fair amount of time trying to find the material I had on these Suttas. If someone come help me out even with these vague descriptions it would be much appreciated. If I rediscover them first, I will make sure to post them here.
I found what I was looking for! Had to get an old laptop out of the closet, but where there is a will there is a way!
You might enjoy Bhante Sujato’s discussion of the Aṭṭhakavagga :