If at least one person is standing in front of a row of identical-looking red vending machines.
return person ;return vending machines ;return #2 that are red ;return #3 that are identical-looking ;return row of #4 ;return #1 standing in  front of #5 ;return the  number of  #6 ;return if  #7 is at least one
['select', 'select', 'filter', 'filter', 'project', 'filter', 'aggregate', 'boolean']