If there are railings made of wood in each image
return railings ;return wood ;return #1 made of #2 ;return images ;return #4 of #3 ;return the  number of  #4 ;return the  number of  #5 ;return if  #6 is equal to  #7
['select', 'select', 'filter', 'select', 'filter', 'aggregate', 'aggregate', 'boolean']