\documentclass{article}
\usepackage{xcolor}
\pagestyle{empty}
\begin{document}
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\def\C##1##2##3{{\color[RGB]{##1}\rule{##2\liafalength}{##3\liafalength}}}%
\def\R##1##2{{\color{black}\rule{##1\liafalength}{##2\liafalength}}}%
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