  We assume that the two hidden charm pentaquark discovered at $LHCb$ are built
by the three light quarks and the $c \bar{c}$ pair, both colour octets. in
relative P-wave for the $\frac{5}{2}^+$ state and by the eigenvectors of the
chromomagnetic interaction for the five constituents in S-wave for the four
$\frac{3}{2}^-$ state with masses $4360$, $4410$, $4490$ and $4560$ MeV . The
"open channel" $p $ $J/\psi$ has large components along the two first states
and so appear as the $4380$ resonance and the $\Lambda_c$ $ \bar{D}^{0*}$ and
$\Sigma_c$ $\bar{D}^*$ are "open channels" for the lower and higher resonances,
respectively. The expectation for their strange isoscalar partners is to have a
mass larger by an amount of the order or smaller than the $M_{\Lambda} - M_N$
mass difference. We account for the small width of the $\frac{5}{2}^+$, since
its decay needs the exchangeof a gluon and stress that the decays of particles
with "beauty" provide the best experimental framework for the discovery of
hidden charm multiquarks. The relevance of the production mechanics shows the
reason why only some of the states with non minimal number of constituents have
been found.
