Slide 36
Slide 36 text
Dcoetzee (Wikipedia), Absolute difference, CC-A3:
https://en.wikipedia.org/wiki/File:Absolute_difference.svg
Juan Felipe Villegas, Unidad deportiva Atanasio
Girardot, CC-SA:
https://en.wikipedia.org/wiki/File:Atanacio_girardot_antes_de
_la_apertura_de_los_juegos.jpg
Yuna-yume (Devian art), Gokú:
https://www.deviantart.com/yuna-yume/art/Goku-40385752