user: ### NOW ANSWER:
Question: What's the singer part number of the buttonholer whose storage case is a green plastic box?
Columns: ['For shank type', 'Singer part number', 'Uses templates?', 'Description', 'Storage case']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['low', '86718', 'no', 'ivory and red metal', 'red plastic box']
SQL:

assistant: SELECT "Singer part number" FROM "Table" WHERE "Storage case" = 'green plastic box';