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% https://alfurka.github.io/quick-tikz/
\begin{tikzpicture}[background rectangle/.style={fill=white}, show background rectangle]
% Axis
\draw[step=1,gray,very thin] (-5,-5) grid (5,5);
% Pixels
\draw[fill=lightgray,ultra thin] (-4,-4) rectangle ++(1,1);
\foreach \y in {-3,-2}
\foreach \x in {\y-1,\y}
\draw[fill=lightgray,ultra thin] (\x,\y) rectangle ++(1,1);
\draw[fill=lightgray,ultra thin] (-1,-2) rectangle ++(1,1);
\foreach \y in {-1,0,1,2}
\foreach \x in {\y,\y+1}
\draw[fill=lightgray,ultra thin] (\x,\y) rectangle ++(1,1);
% Main shape
\draw[blue] (-4,-3.5) -- (3.5,2.5);
\end{tikzpicture}
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