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WTBA Contact Type

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'wtba_contact_type',
		'value'   => 's:4:"main";s:3:"Yes"',
		'compare' => 'LIKE',
	),
	array(
		'key'     => 'wtba_contact_type',
		'value'   => 's:4:"main";s:2:"on"',
		'compare' => 'LIKE',
	),
);