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Beginners mistake. These are minus (-) not hyphen (‐) characters. </unicode-jibe>

You are being downvoted but apparently that is what /r/books is claiming the reason is: https://www.reddit.com/r/books/comments/2pcnv2/amazon_remove...

I guess it causes issues with bad screen readers.

Beginner's mistake. "Beginners mistake" can only be used as the start of a sentence as in "Beginners mistake azure for blue."

Some beginners mistake "Beginners mistake" as a phrase that can only be used at the start of a sentence. :)