Revert "Revert "Book10""

This reverts commit 0bed095cddf64d8b0e859b2a280baa2a5a8e2236.
Revert "Revert "Book8""

This reverts commit ea7f6b715df80a83a33b7f12119ef6ab89e0d688.
Revert "Revert "Book4""

This reverts commit 68d789b604a8edf061545ab3175f60b047840824.