2023-12-05 TokyoWesterns 6th CTF 2020 https://rkm0959.tistory.com/163 https://s3v3ru5.github.io/notes/tokyowesternsCTF#sqrt https://gist.github.com/nomeaning777/dc1ff2a08895ad871f9c6b4851bd831b#file-twin-d-sage