Revert "Book3"

This reverts commit 54d359d00610305064f22582207361d288d88e7e.
Revert "Book8"

This reverts commit e562afd4168d2c325d01a04173e50c23150b468c.
Revert "Book10"

This reverts commit 20955704325a9ed8773d99cd546dd608eb293758.
Revert "Revert "Book3""

This reverts commit ee6425bcf3ee6f9689299de9756ba9d0ce1408d4.
Revert "Book4"

This reverts commit 83420d348f6a62e0e2ca236e1a696d2e15726898.