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The three rules of the Librarians of Time and Space are: 1) Silence; 2) Books must be returned by no later than the date shown; and 3) Do not interfere with the nature of causality.

Terry Pratchett
Book, Space, Silence
Terry Pratchett (2008). “Guards! Guards!: (Discworld Novel 8)”, p.187, Random House
The three rules of the Librarians of Time and Space are: 1) Silence; 2) Books must be returned by no later than the date shown; and 3) Do not interfere with the nature of causality.