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// WP_Query arguments
$args = array(
	'post_type'              => array( 'page' ),
	'post_status'            => array( 'publish' ),
	'meta_query'             => array(
		'relation' => 'AND',
		array(
			'key'     => 'berufsbezeichnung',
		),
		array(
			'key'     => 'postleitzahl',
		),
	),
);

// The Query
$query = new WP_Query( $args );