If there are a total of four dumbbell bars with only two having weight on them.
return dumbbell bars ;return number of  #1 ;return if  #2 is equal to  four ;return weight ;return #1 that has #4 on ;return number of  #5 ;return if  #6 is equal to  two ;return if  both  #3 and #7 are true
['select', 'aggregate', 'boolean', 'select', 'filter', 'aggregate', 'boolean', 'boolean']