I have had my question put on hold/blocked because I was asking about a specific cryptanalysis example, which would detract from the general usefulness of the question to others, even though I was simply asking for general advice on how to proceed with the cryptanalysis.
Quoting the question:
Compression function cryptanalysis
A compression function converts a fixed-sized input into a smaller fixed size output. Suppose one had a large collection of input-output pairs, hundreds of examples of collisions, and even some triple collisions. What is the standard way this would be cryptanalyzed?
If this is not the place to ask specific questions about cryptography, where is better?