Doubly-heavy tetraquark states <inline-formula><tex-math id="M1">\begin{document}${\boldsymbol c \boldsymbol c\bar{\boldsymbol u}\bar{\boldsymbol d}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2021-0525_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2021-0525_M1.png"/></alternatives></inline-formula> and <inline-formula><tex-math id="M2">\begin{document}${\boldsymbol b \boldsymbol b\bar{\boldsymbol u}\bar{\boldsymbol d}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2021-0525_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2021-0525_M2.png"/></alternatives></inline-formula>

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