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<?php
$array1 = array("OH" => "Ohio", "CA" => "California", "HI" => "Hawaii");
$array2 = array("50" => "Hawaii", "CA" => "California", "OH" => "Ohio");
$array3 = array("TX" => "Texas", "MD" => "Maryland", "KS" => "Kansas");
$diff = array_diff_assoc($array1, $array2, $array3);
print_r($diff);
?>
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