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select c1.customer_id, c1.first_name, c1.last_name, c2.customer_id, c2.first_name, c2.last_name from customer as c1 join customer as c2 on c1.customer_id != c2.customer_id AND c1.first_name = c2.last_name order by c1.customer_id ; show status like 'Last_query_cost';

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