Pre-cal https://drive.google.com/drive/folders/1HvxSRxJHbzXp_chG8NgwyFVbbDsH9736?usp=sharing
Alg 2 https://drive.google.com/drive/folders/1IDpf9UZr_xlpHU1p7zrnGidxHBqAJmuj?usp=sharing
