| we have decided to to write this letter as an appreciation of your hard work | Thank you so much for all the support, we wish you a good luck |
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| Thank you so much for being my teacher | I appreciate your time and I hope the best for you |
| we have learned many things from you in the class, and you were very helpful for us | You are one of the best teachers for me and I respect you so much |
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| you have been so helpful to us and I have learned so much from you and your class |