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<?php
class Solution
{
    public function singleNumber($nums)
    {
        $single = 0;
        foreach ($nums as $num)
        {
            $single ^= $num;
            echo $num;
        }
        return $single;
    }
}
$solution = new Solution();
echo $solution->singleNumber(array(1,1,2,3,2,4,4,5,3));
?>