I have a macro I've been using that cleans up documents. For instance, for the sentence "This is like X i.e. which is like Y", my macro adds commas before and after "i.e.": "This is like X, i.e., which is like Y".

This macro has the following code at the beginning:

I have determined what "ClearFormatting" does, but why do I have two statements in a row like this, and what does "Replacement" add?

(The macro works fine, but I added something before these lines, and went to comment these lines...only to realize I'm not sure what they do.)