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706.tex
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! Missing } inserted.
<inserted text> 
                }
l.7 $$\bf{\hat x_k\}$
                     $\end{document}
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.

[1

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