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::The right side of this expression can be expanded as
:::<math>N = a_0^2 + 2a_0 \sum_{i=1}^{n-1}a_i + a_1^2 + 2a_1 \sum_{i=2}^{n-1}a_i + \ldots + a_{n-1}^2.</math>
::Define
:::<math>d_m =
\begin{cases}
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