The most obvious spectral property of a truly random function $\boldsymbol{f} : \{1,1\}^n \to \{1,1\}$ is that all of its Fourier coefficients are very small (as we saw in Exercise 5.8).
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The most obvious spectral property of a truly random function $\boldsymbol{f} : \{1,1\}^n \to \{1,1\}$ is that all of its Fourier coefficients are very small (as we saw in Exercise 5.8). [...] 

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