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What $n$-linear sums can be extracted from a product of linear polynomials in $m$ variables?
Let $\boldsymbol{c}_1, ..., \boldsymbol{c}_n$ be $n$ orthonormal, $m$-dimensional complex vectors, with $\boldsymbol{c}_i = (c_{i,1}, ..., c_{i,m})$.
Consider the following polynomial in $x_1,..., x_m$...
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