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"id" Used for global file linking (case sensitive)
"title" Title as it's shown in the codex interface
"contentPages" What's actually written in the codex (Read below)

Content pages follow a strict format:

"<Text>" defines start and end of a page
Commas seperate Pages
Spaces are actual spaces, line breaks are actual line breaks
DO NOT USE TAB while writing a codex, this will result in a strange rectangle in your finished codex.