https://drive.google.com/file/d/1TAKihmlPqfkl2A2vsmEaX3DEDhIgWCWy/view?usp=sharing
https://drive.google.com/file/d/1hJlWcGpnjXl8-fDMQe0K_oldZjdAsHFm/view?usp=sharing (MP3)
https://drive.google.com/file/d/15c6LsHudrU8icrBpHF5QOfcegvHzuWxW/view?usp=sharing (discussion)
appendix
https://drive.google.com/file/d/1EXIYRC5_2DHhp-8m5MhzxC7Ftwqsamee/view?usp=sharing
