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$x >= $x_min and $x <= $x_max and $y >= $y_min and $y <= $y_max
($x >= $x_min and $x <= $x_max) and ($y >= $y_min and $y <= $y_max)
$x_min <= $x and $x <= $x_max and $y_min <= $y and $y <= $y_max
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