export - Mathematica inserts extra left and right for absolute values in LaTeX output

Type the following in a Mathematica DisplayFormula cell(other styles may also encounter this problem): Esc+ $l$ +|+Esc and Esc+ $r$ +|+Esc, and save as LaTeX.

Note: See the difference of the character between | |.

$z$ and $z_1$, $|z|$, $|z_1|$

Cell[BoxData[
 RowBox[{"\[LeftBracketingBar]", 
 SubscriptBox["z", "1"], "\[RightBracketingBar]"}]], "DisplayFormula"]

with subscript, then...

Mathematica inserts extra \left and \right for absolute values in the LaTeX output:

%% AMS-LaTeX Created by Wolfram Mathematica 9.0 : www.wolfram.com
\documentclass{article}
\usepackage{amsmath, amssymb, graphics, setspace}
\newcommand{\mathsym}[1]{{}}

\newcommand{\unicode}[1]{{}}
\newcounter{mathematicapage}

\begin{document}
\[
\left\left| Z_1+Z_2\right\right| \leq \left\left| Z_1\right\right| +\left\left| Z_2\right\right|
\]
\end{document}

What should I do to get valid output that LaTeX will accept?

Comments

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