If there is at least one aluminum ladder leaning against a thatched roof.
return ladders ;return #1 that are aluminum ;return roofs ;return #3 that are thatched ;return #2 leaning against #4 ;return number of  #5 ;return if  #6 is at least one
['select', 'filter', 'select', 'filter', 'filter', 'aggregate', 'boolean']