If there is atleast one boat with numbers or letters on the sail
return boats ;return sails of  #1 ;return #1 where #2 have  numbers ;return #1 where #2 have  letters ;return #3 ,   #4 ;return number of  #5 ;return if  #6 is  at least one
['select', 'project', 'comparative', 'comparative', 'union', 'aggregate', 'boolean']