Let $f$ be a real valued funditon, defined on $R-\{-1$, $1\}$ and given by
$$
f(x)=3 \log _e\left|\frac{x-1}{x+1}\right|-\frac{2}{x-1}
$$
Then in which of the following intervals, function $\mathrm{f}(\mathrm{x})$ is increasing ?
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