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<?php
header("Content-type: image/gif");
$image = imagecreate( 200, 200 );
$red = imagecolorallocate($image, 255,0,0);
$blue = imagecolorallocate($image, 0,0,255 );
$points = array (10, 10,
190, 190,
190, 10,
10, 190
);
imagefilledpolygon( $image, $points, count( $points )/2 , $blue );
imagecolortransparent( $image, $red );
imagegif($image);
?>
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