Dear calculator, Thanks for being so lovely as to serve me so well during my senior high days. I once blamed you for being user-unfriendly, but that's in the past. I wanna thank you for surviving all tests and exams throughout 2010-2011, and never once abandoned me by shutting down without my permission. Even though panicky me did fear countless of times that you would die on me, but you never did, and I'm truly grateful for that :) Besides, you have been a great buddy, for never looked down on me once for using you to calculate sums like 1+1 or 2--1 :) Now that I changed my working environment, your batteries decided to fall flat and leave me unable to calculate 3(x^4) x 5(x^3), But do not misunderstand, I do not blame you, not at all. Instead, I thank you and your batteries for the great service during a levels year :) Loves and regards, Your owner xiaowei :)