If at least 2 people are standing on the ground next to the school bus.
return people ;return ground ;return school bus ;return #1 standing on #2 ;return #4 that is next to  #3 ;return the  number of  #5 ;return if  #6 is at least two
['select', 'select', 'select', 'filter', 'filter', 'aggregate', 'boolean']