$\begin {array} {1 1} (1)\;\pi \sigma D^2(n^{\large\frac{1}{3}}-1) & \quad (2)\;\pi \sigma D^2(n^{\large\frac{2}{3}}-1) \\ (3)\;\pi \sigma D^2(n-1) & \quad (4)\;\pi \sigma D^2(n^{\large\frac{4}{3}}-1) \end {array}$

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