naming conventions in the code.

[sanster9292]

Hey there,
I am trying to understand and implement the code on my own and I wanted to know the logic behind the naming convention of orig_rev in preprocess.py. I think this would help me create a mental map of the logic behind the code.

[sanster9292]

Is it possible for you to put up a doc explaining the naming conventions such as TREC in preprocess.py.

If possible, I would love to do it. I have read this paper many times and I am very familiar with what is going. I think that this might help me appreciate the paper/code more.