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SELECT a.customer_id AS customer_id_1 a.first_name AS first_name_1 a.last_name AS last_name_1 b.customer_id AS customer_id_2 b.first_name AS first_name_2 b.last_name AS last_name_2 from customer AS a LEFT OUTER JOIN customer AS b ON a.first_name_1=b.last_name_2 ORDER BY a.customer_id_1;

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