Remove excessive minus in chapter 4
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@ -393,7 +393,7 @@ cout << *it << "\n";
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\end{lstlisting}
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Iterators can be moved using the operators
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\texttt{++} (forward) and \texttt{---} (backward),
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\texttt{++} (forward) and \texttt{--} (backward),
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meaning that the iterator moves to the next
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or previous element in the set.
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