If the left and right image contains the same number of travel buses.
return left image ;return travel buses of #1 ;return right image ;return travel buses of #3 ;return the  number of  #2 ;return the  number of  #4 ;return if  #5 is equal to  #6
['select', 'project', 'select', 'project', 'aggregate', 'aggregate', 'boolean']