English: https://github.com/10secTW/ctf-writeup/blob/master/2019/balsn%20CTF/listcomp%20ppm/listcomp_ppm_en.md
Chinese: https://github.com/10secTW/ctf-writeup/blob/master/2019/balsn%20CTF/listcomp%20ppm/listcomp_ppm_zh.md