extra-01-example-forest.md

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[linguistics]{forest}
\begin{document}
\begin{forest}
[VP
  [DP\\John ]
  [V’
    [V\\sent ]
    [DP\\Mary ]
    [DP[D\\a][NP\\letter]]
  ]
]
\end{forest}
\end{document}