Ass1 week1: https://www.mediafactory.org.au/shijie-luo/2020/03/14/week1/ week2: https://www.mediafactory.org.au/shijie-luo/2020/03/14/week2/ week3: https://www.mediafactory.org.au/shijie-luo/2020/03/18/week3/