[Oops.] Chapter 3, Exercise 31—Upside down towers

[emilykfox]

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Chapter number or note title: Chapter 3

Page number: 141

Error description:

In Chapter 3, Exercise 31, the first constraint for moving a disk to a different peg states "we must never place a smaller disk on top of a larger disk". The alternative would be to place larger disks on top of smaller ones, making the towers wobbly.

Suggested fix (if any):

Change the first constraint to state "we must never place a larger disk on top of a smaller disk".