Hello, Instructor Kim Dong-gyu. I am writing this because I got 91 points (21 in short answer, 30 in task type 1, 40 in task type 2) in the 4th Big Data Analysis Engineer practical exam through this lecture. I think it is definitely focused on the content for obtaining the Big Data Analysis Engineer. Saving the content I practiced with Colab and reading it through once or twice more for review was repetitive learning, and it was especially helpful to master my own optimized code based on the actual compression code. Instructor, I ask for many good lectures and I hope you prosper even more. Thank you.