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How many parts is Kamen Rider divided into?

Showa series: "(First Generation) Kamen Rider", "Kamen Rider V3", "Kamen Rider X", "Kamen Rider Amazon", "Kamen Rider Stronger", "Kamen Rider "Rider Sky Rider", Kamen Rider "Super One", "True Kamen Rider", "Kamen Rider Black", "Kamen Rider Black RX", and the two protagonists Kamen Rider ZO and Kamen Rider J Appears in the theatrical version.

Heisei series: "Kamen Rider Kuuga", "Kamen Rider Agiti", "Kamen Rider Ryuki", "Kamen Rider 555", "Kamen Rider Sword", "Kamen Rider "Kamen Rider Hibiki", "Kamen Rider Kabuto", "Kamen Rider Den-O", "Kamen Rider Kiva", "Kamen Rider Decade", "Kamen Rider W", "Kamen Rider OOO", "Kamen Rider OOO" "Kamen Rider Fourze", "Kamen Rider Wizard", "Kamen Rider Armor", "Kamen Rider Drive", "Kamen Rider Ghost", "Kamen Rider Ex-Aid", "Kamen Rider Build", "Kamen Rider Zi-O" (currently being updated).

In addition, Zi-O is the last Knight of Heisei. Japan is about to change its era name, so it will be a new era of Knights in the future.