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I agree with the other and think it is not possible by default.
However, there is a software you can easily install in your Paperwhite, a hack, called JBPatch. It has this option and also allows you to add hyphenation to make the reading clearer (among other improvements).
I can't take the link now in the smartphone I'm browsing, but you'll find JBPatch thread in the Developers Corner in the Kindle section.
Best Wishes,
Antoine
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