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<?php 
	$double = [21, 30, 14, 51, 51, 64, 67, 28];
	$flag 	= false;

	foreach ($double as $n) {	
			if (current($double) == next($double)){
				$flag = true;
				break;
			}
		}

	if ($flag == true) {
		echo 'YES';
	}
	else {
		echo 'NO';
	}
	?>