If only black kneepads are shown, and the left and right images contain the same number of kneepads.
return kneepads ;return #1 that are black ;return number of  #1 ;return number of  #2 ;return if  #3 is equal to  #4 ;return left image ;return right image ;return #1 that are in  #6 ;return #1 that are in  #7 ;return number of  #8 ;return number of  #9 ;return if  #10 is equal to  #11 ;return if  both  #5 and #12 are true
['select', 'filter', 'aggregate', 'aggregate', 'boolean', 'select', 'select', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean']