I might have missed it today in your articles or comments here--it's been a hectic day--but has there been some study of just how different code would be given that the students are using the same text from questions? Is there randomization intrinsic to Copilot, or is it just because minor variations in textual input causes code to be so different?

My wife taught CS, she did catch cheaters pre-Copilot, and my first thought it that she probably would enter test questions and print out a reference sheet for Copilot generated results.