LaTeX code for a basic stemma codicum

stemma.ltx

% I asked ChatGPT-4 for help with displaying a stemma codicum in LaTeX.
% Here is what I asked: "Please generate LaTeX code for a chart in which β is the parent and V and γ are the children.
% This is what it generated:

\documentclass[tikz,border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{trees}

\begin{document}
\begin{tikzpicture}[sibling distance=10em]
  \node {β}
    child { node {V} }
    child { node {γ} };
\end{tikzpicture}
\end{document}

% Here is a more complex stemma:
\documentclass[tikz,border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{trees}

\begin{document}
\begin{tikzpicture}[sibling distance=10em]
  \node {α}
    child { node {β} 
      child { node {V} }
      child { node {γ}
        child { node {Pr} }
        child { node {δ}
          child { node {B} }
          child { node {D} } } } };
\end{tikzpicture}
\end{document}