The diagram below (originally published on the inside front cover of the Japanese edition's manga volume two) was included in many of the international translations. However, it was not included in the English translation. To rectify this terrible injustice to the English reading world, here is the Japanese diagram modified with English pop-up windows. Enjoy. Spanish-translated version of the diagram. French-translated version of the diagram.

Translation by Julio Gea-Banacloche with Benjamin Ettinger & Scott Ryan