  We propose the stringy description of the system consisting of two heavy and
four light quarks in the case of two light flavors of equal mass. As an
application, we consider the three low-lying Born-Oppenheimer potentials as a
function of the heavy quark separation. Our analysis shows that the ground
state potential is described in terms of both hadro-quarkonia and hadronic
molecules. A connected string configuration makes the dominant contribution to
the potential of an excited state at small separations, and for separations
larger than $0.1\,\text{fm}$, it exhibits the diquark-diquark-diquark structure
$[Qq][Qq][qq]$. For better understanding the quark organization inside the
system, we introduce several critical separations related to the processes of
string reconnection, breaking and junction annihilation. We also discuss the
simplest string configurations including the five-string junctions and their
implications for the system, in particular the emergence of composite quark
objects different from diquarks and the process of junction fusion.
