Task: Text to Code
Input (English): Step 1: For each row in Problems table, find corresponding rows in Product table and in Staff table.
Step 2: find product_name of the results of step 1 whose staff_first_name equals Champlin and staff_first_name equals Lacey.
Step 3: find product_name of the results of step 1 whose staff_first_name equals Kenton.
Step 4: show the rows that are in both the results of step 2 and the results of step 3
Output (English): SELECT T1.product_name FROM Product AS T1 JOIN Staff AS T2 JOIN Problems AS T3 ON T1.product_id = T3.product_id AND T3.closure_authorised_by_staff_id = T2.staff_id WHERE T2.staff_first_name = "Lacey" AND T2.staff_first_name = "Champlin" INTERSECT SELECT T1.product_name FROM Product AS T1 JOIN Staff AS T2 JOIN Problems AS T3 ON T1.product_id = T3.product_id AND T3.closure_authorised_by_staff_id = T2.staff_id WHERE T2.staff_first_name = "Kenton"