id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ssh-490	Chen, Junyu	2020 World Happiness Data Analysis Report 	2022	5	.pdf	application/pdf	1520	98	58	[3] World happiness report 2020. Happiness index is an index value that measures and compares how much or how much happiness people get in a certain period of time.	cache/ssh-490.pdf	txt/ssh-490.txt