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

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