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• Over the range of a1 from 0 to 0.8, D increased five to ten-fold (or five to ten times, or by a factor of five to ten, or by five to ten times).
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• Over the range of a1 from 0 to 0.8, D increased five to ten-fold (or five to ten times, or by a factor of five to ten, or by five to ten times).