/usr/share/doc/texlive-doc/latex/latex-graphics-companion/4-6-37.inl

\usepackage {pstricks,pst-node,pst-tree}
\pstree{\Tdot}
{
\Tdot
\pstree{\Tdot}
 {
 \pstree{\Tdot}
  {\Tdot \Tdot \Tdot}
  \Tdot
 }
}

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