GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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\documentclass{minimal}
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\usepackage{amsmath}
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\usepackage[active,tightpage]{preview}
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\setlength\PreviewBorder{1pt}
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\usepackage{pgf}
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\usepackage{tikz}
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\usepgfmodule{plot}
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\usepgflibrary{plothandlers}
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\usetikzlibrary{shapes.geometric}
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\usetikzlibrary{shadings}
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\begin{document}
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\begin{preview}
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%tikz
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\begin{tikzpicture}[every node/.style={draw,scale=1pt,
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minimum width=20pt,inner sep=3pt,
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line width=0pt,draw=black}]
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\matrix[row sep=2pt,column sep=2pt]
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{\node[]{21};&
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\node[]{22};&
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\node[]{23};&
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\node[]{24};&
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\node[]{25};&
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\node[]{26};&
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\node[]{27};&
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\node[]{28};&
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\node[]{29};&
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\node[fill=red]{30};&
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\node[]{31};&
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\node[]{32};&
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\node[]{33};&
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\node[]{34};&
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\node[]{35};&
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\node[]{36};&
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\node[]{37};&
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\node[]{38};&
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\node[]{39};&
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\node[fill=green]{40};\\
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\node[left color=red,right color=green]{1};&
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\node[left color=red,right color=green]{2};&
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\node[fill=red]{3};&
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\node[fill=green]{4};&
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\node[left color=red,right color=green]{5};&
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\node[fill=red]{6};&
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\node[]{7};&
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\node[fill=green]{8};&
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\node[]{9};&
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\node[left color=red,right color=green]{10};&
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\node[]{11};&
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\node[]{12};&
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\node[]{13};&
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\node[]{14};&
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\node[fill=red]{15};&
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\node[]{16};&
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\node[]{17};&
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\node[]{18};&
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\node[]{19};&
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\node[fill=green]{20};\\
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};
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\end{tikzpicture}
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\end{preview}
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\end{document}
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