If there are two dogs, one that is looking forward and one that is not.
return dogs ;return #1 that is looking forward ;return #1 besides  #2 ;return number of  #1 ;return number of  #2 ;return number of  #3 ;return if  #4 is equal to  two ;return if  #5 is equal to  one ;return if  #6 is equal to  one ;return if  both  #8 and #9 are true ;return if  both  #7 and #10 are true
['select', 'filter', 'discard', 'aggregate', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean', 'boolean', 'boolean']