Revert "Initial commit"

This reverts commit 1272c995c88f32e7c13986eef5e69895fae19964.

	new file:   dataset/book_1.txt
	new file:   dataset/book_2.txt
	new file:   dataset/book_3.txt
	new file:   dataset/book_4.txt
	new file:   dataset/book_5.txt
	new file:   dataset/book_6.txt
	new file:   dataset/book_7.txt