If in the left image, two oxen are yolked to the cart.
return the  left image ;return oxen in  #1 ;return the  cart in  #1 ;return #2 yolked to  #3 ;return number of  #4 ;return if  #5 is equal to  two
['select', 'project', 'project', 'filter', 'aggregate', 'boolean']