user: Question: When is the last week that has a result of a W 34-21?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 28, 1952', 'at Cleveland Browns', 'L 37-7', 57832.0]
SQL:

assistant: SELECT MAX("Week") FROM "Table" WHERE "Result" = 'W 34-21';