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 x         x
x           x
x           x
x           x
x     x     x
x   x   x   x
x     x     x
x   x   x   x
x     x     x
x   x   x   x
x     x     x
x   x   x   x
x     x     x
x   x   x   x
x     x     x
x           x
x           x
x           x
 x         x
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