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I want to tell you about [name of person in case study], and how he/she [result they achieved] despite [challenge]. It's a great story, and as someone interested in [topic you talk about], I know you'll find it especially motivating.
case study details
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Till next time!
Your Name
PS. Want results like those? Not to worry, I'll be sharing how soon. Keep your eyes open for an email from me!
Credibility building, and teasing a sales offer.