Most of these plugins will have a "scope" which says how to break up the code. The default will be "content" which is actually `//file[has-class('content']` to only analyze chapters.

So, the echo plugins would only process per chapter.

If one used `/project` for the scope, then the echo would consider the last paragraphs of the previous chapter instead of only per-file checking.

This will also let the frequency plugins look for overuse of a word per file or per project.