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 | Attendance |
| --- | --- | --- | --- | --- |
| 1 | September 3, 1978 | at New Orleans Saints | L 31–24 | 54,187 |
| 2 | September 11, 1978 | Denver Broncos | W 12–9 | 46,508 |
| 3 | September 17, 1978 | Tampa Bay Buccaneers | L 16–10 | 46,152 |
| 4 | September 25, 1978 | at Chicago Bears | W 24–20 | 53,551 |
| 5 | October 1, 1978 | at Tampa Bay Buccaneers | W 24–7 | 65,972 |
| 6 | October 8, 1978 | at Seattle Seahawks | L 29–28 | 62,031 |
| 7 | October 15, 1978 | Los Angeles Rams | L 34–17 | 46,551 |
| 8 | October 22, 1978 | Green Bay Packers | W 21–7 | 47,411 |
| 9 | October 26, 1978 | at Dallas Cowboys | W 21–10 | 61,848 |
| 10 | November 5, 1978 | Detroit Lions | W 17–7 | 46,008 |
| 11 | November 12, 1978 | Chicago Bears | W 17–14 | 43,286 |
| 12 | November 19, 1978 | San Diego Chargers | L 13–7 | 38,859 |
| 13 | November 26, 1978 | at Green Bay Packers | T 10–10 (OT) | 51,737 |
| 14 | December 3, 1978 | Philadelphia Eagles | W 28–27 | 38,722 |
| 15 | December 9, 1978 | at Detroit Lions | L 45–14 | 78,685 |
| 16 | December 17, 1978 | at Oakland Raiders | L 27–20 | 44,643 |
Question:
how many times did they play an opponent in november?
Answer:
4