ch12

p12-0:

p12-0

p12-1:

p12-1

p12-13:

p12-13

p12-14:

p12-14

p12-15:

p12-15

p12-16:

p12-16

p12-17:

p12-17

p12-3:

p12-3

p12-8:

p12-8