[Shoe]

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As to the previews, I didn't neccessarily discern whether or not Dexter wrote the manifesto or whether it was just another copycat, but I would also think it is kind of against him to write the manifesto. But the next episode definitely looks incredibly sick and seeing how Dexter/Doakes plays out will be awesome.

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Dexter wrote the manifesto. They make this clear at one of the previews at sho.com