Repeat 9.16, but let (XI ,YI) ~ (X2, Y2) mean that both XI - X2 andYI - Y2 are integers
Chapter 9, Problem 9.17(choose chapter or problem)
Repeat 9.16, but let (XI ,YI) ~ (X2, Y2) mean that both XI - X2 andYI - Y2 are integers.
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