is the smallestt cube the same material as the smallestt ball?
return balls ;return the   size of #1 ;return #1 where #2 are the   smallestt ;return the   material of #3 ;return cube ;return size of #5 ;return #5 where #6 is  the   smallestt ;return the   material of #7 ;return if  #8 is  the   same as #4
['select', 'project', 'comparative', 'project', 'select', 'project', 'comparative', 'project', 'boolean']