Categorization of two-loop Feynman diagrams in the <inline-formula><tex-math id="M1">\begin{document}$ {{\cal O}{\mathit{\boldsymbol{(\alpha^2)}}}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2020-0676_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2020-0676_M1.png"/></alternatives></inline-formula> correction to <inline-formula><tex-math id="M2">\begin{document}$ {{\mathit{\boldsymbol{e^+}}}{{\mathit{\boldsymbol{e^-}}}} {\mathit{\boldsymbol{\rightarrow ZH}}}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2020-0676_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2020-0676_M2.png"/></alternatives></inline-formula>

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