Christmas fractal tree

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% A Christmas tree
% Decorations by Andrew Stacey
% Based on a fractal tree (L-System) drawn in TikZ by Stefan Kottwitz
% Tree example from the book "The Science of fractal images" by Peitgen and Saupe.
\documentclass{article}
\usepackage{tikz}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{10pt}%
\usetikzlibrary{%
  lindenmayersystems,
  decorations.pathmorphing,
  decorations.markings,
  shapes.geometric,
  calc%
}
\tikzset{
  tinsel/.style={
    #1,
    rounded corners=10mm,
    ultra thin,
    decorate,
    decoration={
      snake,
      amplitude=.1mm,
      segment length=10,
    }
  },
  baubles/.style={
    decorate,
    decoration={
      markings,
      mark=between positions .3 and 1 step 2cm
      with
      {
        \pgfmathsetmacro{\brad}{2 + .5 * rand}
        \path[shading=ball,ball color=#1] (0,0) circle[radius=\brad mm];
      }
    }
  },
  lights/.style={
 
 
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