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Taxonomies query

$featured = array(
	'relation' => 'AND',
	array(
		'taxonomy'         => 'category',
		'terms'            => '3',
		'field'            => 'term_id',
		'operator'         => 'IN',
		'include_children' => true,
	),
	array(
		'taxonomy'         => 'featured_on',
		'terms'            => '16',
		'field'            => 'term_id',
		'operator'         => 'IN',
		'include_children' => true,
	),
);