The Clowder Project

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    \\
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    \\
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    \\
    \bullet
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    \bullet
    % Arrows
    % Outer Square
    \arrow[from=1-1,to=1-4]%
    \arrow[from=1-4,to=4-4]%
    %
    \arrow[from=1-1,to=4-1]%
    \arrow[from=4-1,to=4-4]%
    % Inner Square
    \arrow[from=2-2,to=2-3]%
    \arrow[from=2-3,to=3-3]%
    %
    \arrow[from=2-2,to=3-2]%
    \arrow[from=3-2,to=3-3]%
    % Connecting Arrows
    \arrow[from=1-1,to=2-2]%
    \arrow[from=1-4,to=2-3]%
    \arrow[from=3-2,to=4-1]%
    \arrow[from=3-3,to=4-4]%
    % Subdiagrams
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    \arrow[from=2-2,to=3-2,"\scriptstyle\left(2\right)",phantom,xshift=-5.0*\the\DL]%
    \arrow[from=2-2,to=3-3,"\scriptstyle\left(3\right)",phantom]%
    \arrow[from=2-3,to=3-3,"\scriptstyle\left(4\right)",phantom,xshift=5.0*\the\DL]%
    \arrow[from=2-2,to=3-3,"\scriptstyle\left(5\right)",phantom,yshift=-10.0*\the\DL]%
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