If in one image, a row of three vending machines are the same height.
return vending machines ;return #1 in  a  row ;return heights of #2 ;return #2 where  #3 are the  same ;return images of #4 ;return number of  #4 for each  #5 ;return #5 where  #6 is equal to  three ;return number of  #7 ;return if  #8 is equal to  one
['select', 'filter', 'project', 'comparative', 'project', 'group', 'comparative', 'aggregate', 'boolean']