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Which sentence is not punctuated correctly?

1. My former school, Liberty High School, won the state basketball championship last year.

2. I saw my history teacher Mr. Harrison, when I was at the grocery store.

3. We have just finished reading The Red Badge of Courage, an exciting Civil War novel.

4. Middlebury, a small town in the eastern part of the state, is the home of a pottery-making company.