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    squarednode/.style={rectangle, draw=black!60, fill=white!5, very thick, minimum size=1cm},]
    \node[squarednode] at (0.5,0.5) (int) {};
    \node[squarednode] at (1.5,0.5) (int) {};
    \node[squarednode] at (2.5,0.5) (int) {};
    \node[squarednode] at (3.5,0.5) (int) {};
    \node[squarednode] at (0.5,1.5) (int) {};
    \node[squarednode] at (1.5,1.5) (int) {};
    \node[squarednode] at (2.5,1.5) (int) {};
    \node[squarednode] at (0.5,2.5) (int) {};
    
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