What are the distinct grant amount for the grants where the documents were sent before '1986-08-26 20:49:27' and grant were ended after '1989-03-16 18:27:16'?
return grants ;return documents of #1 ;return when  #2 were sent ;return when  #1 ended ;return #1 where #3 is before '1986-08-26 20:49:27 ;return #1 where #4 is after '1989-03-16 18:27:16 ;return #1 in  both #5 and  #6 ;return distinct grant amounts of #7
['select', 'project', 'project', 'project', 'comparative', 'comparative', 'intersection', 'project']