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You should really read the documentation on meta_query's Here is what is allowed in a meta_query key (string) - Custom field key. value (string|array) - Custom field value. It can be an array only when compare is 'IN', 'NOT IN', 'BETWEEN', or 'NOT BETWEEN'. You don't have to specify a value when using the 'EXISTS' or 'NOT EXISTS' comparisons in WordPress ...
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