If all sailboats have at least four sails.
return sailboats ;return sails of #1 ;return number of  #2 for each  #1 ;return #1 where  #3 is at least four ;return number of  #1 ;return number of  #4 ;return if  #6 is equal to  #5
['select', 'project', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean']