Find the name of the company that produces both furnitures with less than 6 components and furnitures with more than 10 components.
select t3.name from furniture as t1 join furniture_manufacte as t2 on t1.furniture_id = t2.furniture_id join manufacturer as t3 on t2.manufacturer_id = t3.manufacturer_id where t1.num_of_component < 6 intersect select t3.name from furniture as t1 join furniture_manufacte as t2 on t1.furniture_id = t2.furniture_id join manufacturer as t3 on t2.manufacturer_id = t3.manufacturer_id where t1.num_of_component > 10