If there are 3 dumbbells, and all of them are on storage trays.
return dumbbells ;return number of #1 ;return If #2 is  equal to 3 ;return storage trays ;return #1 that are  on #4 ;return number of #5 ;return If #6 is  equal to #2 ;return If both  #3 and #7 are  true
['select', 'aggregate', 'boolean', 'select', 'filter', 'aggregate', 'boolean', 'boolean']