Which products have problems reported by both the staff named Lacey Bosco and the staff named 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"