user: Question: What is the production number for bell hoppy in the mm Series?
Columns: ['Title', 'Series', 'Director', 'Production Number', 'Release date', 'reissue?']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Dog Pounded', 'LT', 'I. Freleng', 1278.0, '1954-01-02', 'Yes']
SQL:

assistant: SELECT "Production Number" FROM "Table" WHERE "Series" = 'mm' AND "Title" = 'bell hoppy';