\\(\require{AMScd}\\)
\begin{CD}
\text{EM}\_6\unicode{10227}\tt{Bob} @>\text{EM}\_1>> \tt{Grace} \\\@V\text{EM}\_3VV {}@VV\text{EM}\_2V \\\
\tt{Emory} @. \tt{Pat}
\end{CD}
\begin{array}{ccc}
\tt{Sue}&\unicode{8644}\_{\text{EM}\_5}^{\text{EM}\_4}&\tt{Doug}
\end{array}