Letter of recommendation when a professor says send me what you want me to write in it

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I usually provide professors with a copy of my resume, and a more detailed list of ECs/activities/awards. I've never had one ask me explicitly what to write in it, however. A strong rec letter would include what differentiates you from the other hundred students in his class.
 
I provided them with my CV, and thanks for the advice.
 
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