Xin Yin @xin2023 • Joined Sep 2023 Remove Connection Are you sure you want to remove from your connections? Profile Groups Forums Discussions Replies Favorites Discussions Replies Favorites Forum Replies Created Xin Yin Member December 10, 2023 at 12:46 pm in reply to: Great Information , ineffective for average people like me. I’m a newbie. Can I ask what is SPER?