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x        x          x   xx     x
x    x   x x    x    x         x
xxxx xx  x    x x x   x  x     x
x      x  x    x  xxx Ex  x    x
x   x  x  x x  xx    xx  x     x
x   x  x xx   x  xx  x  x      x
x   x  x  x  x     xx x  x     x
x   x   x   x x xx  x  x  x    x
x   x    xxx   x     x  x  x   x
x x  xxxxx  x     x   x  x  x  x
x  xx     x      x    x x  x   x
x  x  xx   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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