\begin{document}$J^{PC}=1^{+-}$\end{document} using the QCD sum rules. We observe one axialvector tetraquark candidate for \begin{document}$Z_c(3900)$\end{document} and \begin{document}$Z_c(4430)$\end{document}, two axialvector tetraquark candidates for the \begin{document}$Z_c(4020)$\end{document}, and three axialvector tetraquark candidates for \begin{document}$Z_c(4600)$\end{document}."> Axialvector tetraquark candidates for <i>Z<sub>c</sub></i>(3900), <i>Z<sub>c</sub></i>(4020), <i>Z<sub>c</sub></i>(4430), and <i>Z<sub>c</sub></i>(4600) -
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