Dear {Name},
I am very sorry that I was so mean to you. I know that {hitting/teasing/excluding} is wrong, and I shouldn't have bullied you. I would have been really sad and hurt if it had been me, and I'm sorry if I made you feel that way.
Next time I'm feeling mad or upset I will {solution} instead of taking it out on other people. I hope that we can be friends, and maybe do {activity} together sometime. I hope you can forgive me for what I did.
Sincerely,
{Sender}
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