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Dear Professor Smith,

I wanted to express my disappointment with the grade I received on the recent assignment. I felt that I met all of the required criteria and spent a lot of time working on it. I would appreciate it if you could review my work and reconsider my grade.

Thank you,
John
Dear Professor Smith,

I respectfully express my disappointment regarding the grade I received on my recent assignment. I believe that I have fulfilled all the necessary criteria and devoted a considerable amount of time working on it. It would be greatly appreciated if you could kindly review my work and reconsider my grade.

Thank you for your time,
John