  The pentaquark states, $P_{c}(4312)$, $P_{c}(4440)$ and $P_{c}(4457)$, could
be nicely arranged into a multiplet of seven molecules of
$\bar{D}^{(\ast)}\Sigma_{c}^{(\ast)}$ dictated by heavy quark spin symmetry.
However, the spins of $P_c(4440)$ and $P_c(4457)$ are not yet fully determined.
In this work we employ the contact-range effective field theory to investigate
the $SU(3)$-flavor counterparts of $\bar{D}^{(\ast)}\Sigma_{c}^{(\ast)}$, and
study the possibility whether their discovery can help determine the spins of
$P_c(4457)$ and $P_c(4440)$. We find the existence of a complete hidden charm
strange multiplet of $\bar{D}^{(\ast)}\Xi_{c}^{(\prime\ast)}$ molecules
irrespective of the spins of $P_c(4440)$ and $P_c(4457)$. On the other hand, we
find that although molecules of $\bar{D}^{(\ast)}\Xi_{c}$ are also likely,
depending on the realization of the underlying dynamics, their discovery can be
more useful to determine the spins of $P_{c}(4440)$ and $P_{c}(4457)$ and to
tell how the heavy quark and light quark interaction depends on the spin of the
light quark pair.
