  The major goal of high-energy heavy-ion collisions is to study the properties
of the deconfined quark gluon plasma (QGP), such as partonic collectivity. The
collective motion of constituent quarks can be derived from the anisotropic
flow measurements of identified hadrons within the coalescence framework. Based
on published results of elliptic flow ($v_2$), we shall test the coalescence
sum rule using $K^{\pm}$, $p$, ${\bar p}$, $\Lambda$ and ${\bar \Lambda}$, and
further extract $v_2$ values for produced $u$($d$, $\bar u$, $\bar d$), $s$ and
$\bar s$ quarks, as well as transported $u(d)$ quarks in 10-40\% Au+Au
collisions at $\sqrt{s_{\rm NN}}=$ 7.7, 11.5, 14.5, 19.6, 27, 39 and 62.4 GeV.
We also attempt to link the $v_2$ difference between $\pi^-$ and $\pi^+$ to the
different numbers of $u$ and $d$ quarks in the initial gold ions, and to relate
the $v_2$ measurements of multi-strange hadrons to the formation times of
$\phi$, $\Omega^\pm$ and $\Xi^+$.
