Spam in my blow posts

Hi,

In my blog posts there is an area called “Related Posts” with links to spammers’ websites. It appears like this under the post I wrote:

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Related Posts

Apocalypse Rising 174 “We’re Uncrushable”
Celente on 2010: Wave of Terror, Internet revolt & War on migration
Halloween puzzle
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This is on each and every blog post. I did not put this here and can’t find how to remove it from my blog’s theme editor. How do I get rid of this?

Thanks, Tom