CREATE TABLE product (product_name VARCHAR2, product_id VARCHAR2)
CREATE TABLE staff (staff_id VARCHAR2, staff_first_name VARCHAR2, staff_last_name VARCHAR2)
CREATE TABLE problems (product_id VARCHAR2, reported_by_staff_id VARCHAR2)

Find the products which have problems reported by both Lacey Bosco and Kenton Champlin?
SELECT T2.product_name FROM problems AS T1 JOIN product AS T2 JOIN staff AS T3 ON T1.product_id = T2.product_id AND T1.reported_by_staff_id = T3.staff_id WHERE T3.staff_first_name = "Lacey" AND T3.staff_last_name = "Bosco" INTERSECT SELECT T2.product_name FROM problems AS T1 JOIN product AS T2 JOIN staff AS T3 ON T1.product_id = T2.product_id AND T1.reported_by_staff_id = T3.staff_id WHERE T3.staff_first_name = "Kenton" AND T3.staff_last_name = "Champlin"
SELECT "T2"."product_name" FROM "problems" "T1" JOIN "product" "T2" ON "T1"."product_id" = "T2"."product_id" JOIN "staff" "T3" ON "Bosco" = "T3"."staff_last_name" AND "Lacey" = "T3"."staff_first_name" AND "T1"."reported_by_staff_id" = "T3"."staff_id" INTERSECT SELECT "T2"."product_name" FROM "problems" "T1" JOIN "product" "T2" ON "T1"."product_id" = "T2"."product_id" JOIN "staff" "T3" ON "Champlin" = "T3"."staff_last_name" AND "Kenton" = "T3"."staff_first_name" AND "T1"."reported_by_staff_id" = "T3"."staff_id"