Instead of pressing the Change button for each misspelled word in the document, you can correct all of your misspelled cities as larger blocks of corrections.

The easiest way to check for repeating words is to use Excel's Find and Replace feature. By using this feature, you can also replace the words with something else automatically.

If you need to add a comma after the first word in each cell in Excel using the Replicate or Substitute function, read through this article.