user: Question: Which spine has 12 issues?
Columns: ['Start month', 'End month', 'Cover', 'Spine', 'Indicia', 'Masthead', 'Number of issues']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Oct–50', 'Aug–58', 'Galaxy Science Fiction', 'Galaxy Science Fiction', 'Galaxy Science Fiction', 'Galaxy Science Fiction', 94.0]
SQL:

assistant: SELECT "Spine" FROM "Table" WHERE "Number of issues" = 12.0;