
Code:
$ S^{N}=\sum_{1\leq b_{1},\ldots,b_{N}\leq n }2^{-(l_{b_{1}}+\cdots+l_{b_{N}})}=\sum 2^{-i}f_{i} $

Code:
$ S^{N}=\sum_{1\leq b_{1},\ldots,b_{N}\leq n }2^{-(l_{b_{1}}+\cdots+l_{b_{N}})}=\sum 2^{-i}f_{i} $
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