user: Question: Which Paper Type has a Denomination of $0.50 and Date of Issue 4 February 2005?
Columns: ['Date of Issue', 'Denomination', 'Design', 'Paper Type', 'First Day Cover Cancellation']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['7 January 2005', '50 cents', 'Hélène L’Heureux', 'Tullis Russell Coatings', 'Vancouver, BC']
SQL:

assistant: SELECT "Paper Type" FROM "Table" WHERE "Denomination" = '$0.50' AND "Date of Issue" = '4 February 2005';