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Yours Sincerely,

Lim Bumhee

Dear Prof.Sungwon Kang, 

In HW 4, in question number 4, in solution, I wrote same things that you have mentioned in the comment. Moreover, in HW5, question number 2, our recurrence true also for negative integers. As I have mentioned in my solution "i" can take any integer value.So by first letting it 0, we define S_(-1) and we will move so on for negative integers. Could you please reassess my papers?

 Kinds