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Manifestly exotic scalar resonance $X_0(2900)^0$ with minimal quark contentof $[\bar{c} \bar{s} u d]$ was reported by LHCb in 2020. More recently LHCbreported discovery of manifestly exotic $T_{c\bar{s}0}(2900)^0$ and$T_{c\bar{s}0}(2900)^{++}$ scalar states, degenerate with the $X_0(2900)$. Weargue that these are three of six members of the flavor $SU(3)_F$ symmetry${\bf 6}$-plet. We predict the partial widths of $D(2900)^{*0}$, the crucialnon-strange missing member of the tetraquark ${\bf 6}$-plet, and discuss theoptimal decay channels for its detection.

Are LHCb exotics $T_{c\bar{s}0}(2900)^0$, $T_{c\bar{s}0}(2900)^{++}$ and $\overline{X}_0(2900)$ members of an $SU_F(3)$ ${\bf 6}$-plet?