By "maintenance burns" (line 55) the author most clearly refers to

ArashMash89 on September 4, 2014

E?!

Plz explain why this is the correct answer. I'm utterly lost.

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Naz on September 18, 2014

Hey! The liner notes are now live in the app. We have highlighted the corresponding lines to each correct answer.

Hope that helps! Please let us know if you have any other questions.