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\documentclass[tikz]{standalone}
\definecolor{linecolor}{RGB}{50,50,147}
\definecolor{ballcolor}{RGB}{198,42,29}
\begin{document}
\begin{tikzpicture}[fill=ballcolor,every circle/.style={radius=2pt},draw=linecolor,line width=1.5pt]
\foreach \i/\xshift in {1/0cm,2/2cm,3/6cm,4/11.5cm} {
\begin{scope}[xshift=\xshift]
\foreach \j in {1,...,\i} {
\draw (\j*1.5,0) -- ++ (138:\j);
\draw (\j*1.5,0) -- ++ (-138:\j);
\fill (\j*1.5,0) circle foreach \k in {1,...,\j} { ++ (138:1cm) circle[]};
\fill (\j*1.5,0) circle foreach \k in {1,...,\j} { ++ (-138:1cm) circle[]};
}
\end{scope}
}
\end{tikzpicture}
\end{document}
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