Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Result | Venue | Attendance |
| --- | --- | --- | --- | --- | --- |
| 1.0 | September 17, 1972 | at Cleveland Browns | W 26-10 | Cleveland Stadium | 75771.0 |
| 2.0 | September 24, 1972 | Oakland Raiders | L 20-14 | Lambeau Field | 56263.0 |
| 3.0 | October 1, 1972 | Dallas Cowboys | W 16-13 | Milwaukee County Stadium | 47103.0 |
| 4.0 | October 8, 1972 | Chicago Bears | W 20-17 | Lambeau Field | 56263.0 |
| 5.0 | October 16, 1972 | at Detroit Lions | W 24-23 | Tiger Stadium | 54418.0 |
| 6.0 | October 22, 1972 | Atlanta Falcons | L 10-9 | Milwaukee County Stadium | 47967.0 |
| 7.0 | October 29, 1972 | Minnesota Vikings | L 27-13 | Lambeau Field | 56263.0 |
| 8.0 | November 5, 1972 | San Francisco 49ers | W 34-24 | Milwaukee County Stadium | 47897.0 |
| 9.0 | November 12, 1972 | at Chicago Bears | W 23-17 | Soldier Field | 55701.0 |
| 10.0 | November 19, 1972 | at Houston Oilers | W 23-10 | Astrodome | 41752.0 |
| 11.0 | November 26, 1972 | at Washington Redskins | L 21-16 | RFK Stadium | 53039.0 |
| 12.0 | December 3, 1972 | Detroit Lions | W 33-7 | Lambeau Field | 56263.0 |
| 13.0 | December 10, 1972 | at Minnesota Vikings | W 23-7 | Metropolitan Stadium | 49784.0 |
| 14.0 | December 17, 1972 | at New Orleans Saints | W 30-20 | Tulane Stadium | 65881.0 |
Question:
Who was the opponent at the game with a result of w 20-17?
Answer:
Chicago Bears