In order to write a good article, it is important to make a rough draft.
Did you know Koichi keeps the rough draft for a poem he wrote in high school in his desk drawer in the office?
I wonder if Aya usually makes a rough pencil drafts first or if she just draws freehand.
Something below your writing isn't what you want to necessarily publish to the world. It's below your writing, after all. This is merely a rough draft.
The reading is all kun'yomi vocab reading, as you can maybe guess from the hiragana sticking out. If you know the readings of the words 下 and 書く separately, you should be able to combine them into one reading. Just don't forget the rendaku here!