Square A'B'C'D' is the image of square ABCD under dilation from center O, by scale factor r. Square A"B"C"D" is the image of square A'B'C'D' under a dilation from center O, by scale factor 1/4. The side lengths of A"B"C"D" are 1/8 of the corresponding side lengths of square ABCD. What is the scale factor r?

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