Database: tracking_grants_for_research
Question: 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'?
SQL: select t1.grant_amount from grants as t1 join documents as t2 on t1.grant_id  =  t2.grant_id where t2.sent_date  <  '1986-08-26 20:49:27' intersect select grant_amount from grants where grant_end_date  >  '1989-03-16 18:27:16'