If the pink rear ends of several primates are visible.
return primates ;return rear end of #1 ;return #1 where  #2 is pink ;return #1 where  #2 is visible ;return #1 in  both  #3 and #4 ;return number of  #5 ;return if  #6 is higher than two
['select', 'project', 'comparative', 'comparative', 'intersection', 'aggregate', 'boolean']