Database: cre_Doc_and_collections (difficulty: simple)
Question: Which unique subset does document owned by Marlin belong to? List the subset name.
SQL: SELECT DISTINCT T1.Document_Subset_Name FROM Document_Subsets AS T1 JOIN Document_Subset_Members AS T2 ON T1.Document_Subset_ID =  T2.Document_Subset_ID JOIN Document_Objects AS T3 ON T2.Document_Object_ID  =  T3.Document_Object_ID WHERE T3.owner  =  'Marlin'