user: Question: What are the Notes of the dinosaur, whose Status is nomen dubium, and whose Location is China?
Columns: ['Name', 'Novelty', 'Status', 'Authors', 'Location', 'Notes']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Alocodon', 'Gen et sp nov', 'Valid', 'Thulborn', 'Portugal', 'n Ornithischia of uncertain placement']
SQL:

assistant: SELECT "Notes" FROM "Table" WHERE "Status" = 'nomen dubium' AND "Location" = 'China';