Direct CP violation in <inline-formula><tex-math id="M2">\begin{document}${ {\boldsymbol D}^{\bf\pm }\to {\boldsymbol\pi}^{\bf\pm} {\boldsymbol\pi}^{\bf +} {\boldsymbol\pi}^{\bf -}} $\end{document}</tex-math></inline-formula> with <inline-formula><tex-math id="M3">\begin{document}${{\boldsymbol a}_{\bf 0}^{\bf 0}{\bf (980)-}{\boldsymbol f}_{\bf 0}{\bf (980)}} $\end{document}</tex-math></inline-formula> mixing

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