Search for the lepton number violating process <inline-formula><tex-math id="M303">\begin{document}${{\boldsymbol J}/{\boldsymbol\psi }{\bf\to}{\boldsymbol K}^{\bf +}{\boldsymbol K}^{\bf +}{\boldsymbol e}^{\bf -}{\boldsymbol e}^{\bf -}{\bf +}{\boldsymbol {c.c.}}}$\end{document}</tex-math></inline-formula> -

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