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\tikzset{unit/.code={\unit=\dimexpr#1\relax}}%
\tikzset{xy/.style={x={#1},y={#1},unit={#1},font={\sffamily\fontsize{.2\unit}{.24\unit}\selectfont},line width=.01\unit}}%
\begin{tikzpicture}[xy=10pt]%
\path [use as bounding box] (0,0) rectangle (10,10);
\foreach \x in {5,...,1} {
\path [fill=blue!\the\numexpr\x*20\relax!red] (5-\x,5-\x) rectangle (5+\x,5+\x);
}
\path [draw] (0,0) rectangle (10,10);
\foreach \x in {0,...,10} {
\path [draw] (\x,0) rectangle (\x,10);
\path [draw] (0,\x) rectangle (10,\x);
}
\foreach \y in {0,...,9}
\foreach \x in {0,...,9} {
\path (\x+.5,\y+.5) node {\x,\y};
}
\end{tikzpicture}%
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