• For each $1\leq i\leq n-1$, there exists $c_{i}\in C$ satisfying one of the following conditions:
    1. We have $x_{i}=f\webleft (c_{i}\webright )$ and $x_{i+1}=g\webleft (c_{i}\webright )$.
    2. We have $x_{i}=g\webleft (c_{i}\webright )$ and $x_{i+1}=f\webleft (c_{i}\webright )$.

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