$total = count($container);
	
	$capacityArray = array();
	$indexArray = array();

	for ($i=0; $i < $total; $i++) { 
		$sum = array_sum($container[$i]);
		$capacityArray[] = $sum;
		$indexSum = 0;
		for ($j=0; $j < $total ; $j++) { 
			$indexSum+= $container[$j][$i];
		}
		$indexArray[] = $indexSum;
	}

sort($capacityArray);
sort($indexArray);

$result = '';
if ($capacityArray == $indexArray) {
	$result = 'Possible';
}
else
{
	$result = 'Impossible';
}
echo $result;