3 OR relation

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'ptcd',
		'value'   => '5000',
		'compare' => '<=',
		'type'    => 'NUMERIC',
	),
	array(
		'relation' => 'AND',
		array(
			'key'     => 'ptcd',
			'compare' => 'NOT EXISTS',
		),
		array(
			'key'     => 'pt',
			'value'   => '5000',
			'compare' => '<=',
			'type'    => 'NUMERIC',
		),
	),
);