Kind of a picky thing, but...
After the five kids have entered the Library and are choosing seats, Mr. Vernon gives each a single sheet of notebook paper and one standard wooden pencil. He instructs them NOT to move from these seats, and informs them that they are to write an essay of "no less than a thousand words". First, unless they are using a really small font on a computer, can 1000 words (other than I and a) fit on a single sheet. Also, a standard pencil would be ground down before the goal was reached, and they are not to move, this includes to sharpen their pencils.