Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 
Chapter 6 Chapter 7 Chapter 8 + extra Chapter 9 Chapter 10
Chapter11 + figure1 + extra + extra1 + extra2 + extra3

Chapter11a

Chapter 12 Chapter 13 + link +link1 + link2 + link3

Chapter 13a

Chapter 14 + Archimedes + Pascal + iceberg + Bernoulli Chapter 15 + Chapter 15