find the total market rate of the furnitures that have the top 2 market shares.
return furnitures ;return market  shares of #1 ;return the  2 highest of #2 ;return #1 where #2 is equal to any of #3 ;return market  rates of #4 ;return sum of #5
['select', 'project', 'aggregate', 'comparative', 'project', 'aggregate']