My cupboard was full of a bunch of stuff, that it couldn’t keep more stuff inside. I didn’t have any choice but get rid off some stuff from it. I get rid of many papers, and some books as well, included my notebook that I have already had since my undergraduate. I wrote my notes about lectures in it, but couldn’t convince me to keep it longer, because I needed some free space in the cupboard for other important stuff. However, I still keep my notebook that I have had since my junior high school.