Let $b\ge 2$ be an integer. Using Sturmian words we describe all irrational real numbers $ξ$ such that the image in $\mathbb{R}/\mathbb{Z}$ of the sequence $(ξ(-b)^n)_{n\ge 0}$ is contained in an interval of length $b^{-1}+b^{-2}-b^{-3}$. In previous work (arXiv:2603.16794) we showed that the image cannot be contained in a shorter interval.
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