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or_food_zoo

$tax_query = array(
	'relation' => 'OR',
	array(
		'taxonomy'         => 'food',
		'terms'            => 'sasa',
		'field'            => 'slug',
	),
	array(
		'taxonomy'         => 'zoo',
		'terms'            => 'ueno',
		'field'            => 'slug',
	),
);