If all the buses are stopped or parked within close proximity to trees.
return buses ;return #1 that are stopped ;return #1 that are parked ;return #2 , #3 ;return trees ;return #4 that are within close proximity to  #5 ;return number of  #1 ;return number of  #6 ;return if  #7 is equal to  #8
['select', 'filter', 'filter', 'union', 'select', 'filter', 'aggregate', 'aggregate', 'boolean']