\item[ $ C \hasparents \set X $ ]
The parents of commit $C$ are exactly the set
$\set X$.
\item[ $ C \ge D $ ]
$C$ is a descendant of $D$ in the git commit
\item[ $ C \hasparents \set X $ ]
The parents of commit $C$ are exactly the set
$\set X$.
\item[ $ C \ge D $ ]
$C$ is a descendant of $D$ in the git commit