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## Homework Statement

I am supposed to prove that if you have a puzzle 8 in this configuration

A B C

D E F

H G

I have to prove that no matter how many moves you make (as you

would a normal puzzle moving one of the adjacent letters into the

blank space) you cannot make the configuration

A B C

D E F

G H

I know you can't. I have moved these letters around all over the place... but how do I start to prove it... I don't know where to start

## Homework Equations

## The Attempt at a Solution

I just want a starting point...