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"The little devil is dressed up in his Halloween costume and is ready to go trick-or-treating. He's so excited to go door-to-door and collect candy, and he's hoping that everyone will be kind enough to give him a treat. He's such a cute little devil that it's hard to resist giving him what he wants." Another way to say this is: "The devilish child is dressed up in his Halloween costume and is ready to go trick-or-treating. He's hoping that everyone will be scared enough to give him a treat."
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