If there is at least one image of chimps sitting or hanging from a tree branch
return chimps ;return tree branch ;return #1 sitting on #2 ;return #1 hanging from  #2 ;return #3 , #4 ;return images of #5 ;return the  number of  #6 ;return if  #7 is at least one
['select', 'select', 'filter', 'filter', 'union', 'project', 'aggregate', 'boolean']