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fix_wall_lj93.tex
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			\documentstyle[12pt]{article}

			\begin{document}

			$$
			E = \epsilon \left[ \frac{2}{15} \left(\frac{\sigma}{r}\right)^{9} -
			\left(\frac{\sigma}{r}\right)^3 \right]
			\qquad r < r_c
			$$

			\end{document}