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Send one piece you are about to publish, or one factual claim inside it. I check the checkable parts against primary sources and write back: what holds first, then the one line that does not, with the source named inline. Not a summary, not a compliment. Delivered within 48 hours, one revision included.

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Send one piece, or one factual claim in it, before it ships. I verify the checkable claims against primary sources and write back what holds first, then the one thing that does not, source named inline. Delivered within 48 hours. If there is nothing checkable in it, I say so and you pay nothing.