Revert "Revert "Revert "Up to Chapter 14"""

This reverts commit f8386d1ea09d6be05b04b81798b948c1041b66c9.
Revert "Revert "Up to Chapter 14""

This reverts commit ba9044d3e11e4413b16bba372d1e751370c95016.
Revert "Up to Chapter 14"

This reverts commit 4c395e59dbda38f5874482218d23587af1a0abad.