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I have not had a chance to express in-person my appreciation for all the great work that you did with us and I wanted to let you know that I did find multiple opportunities to praise your work within [our company] as well as with acquaintances in the industry.
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On behalf of our entire team we would like to extend a "big thank you" to you and your team for your continued support with this important study. The achievements of this project is a true demonstration of the great teamwork we experienced on this team.
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I cannot say enough good things about the quality of work and the team’s ability to meet the requested timelines. [Core] did a great job and [we], including me personally, are very pleased with the results as well as the execution of both studies. I really enjoyed working with you and as well as everyone else on the Core team and I very much appreciate all their hard work.