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 15, 1968 | at Green Bay Packers | L 30–13 | 50,861 |
| 2 | September 22, 1968 | New York Giants | L 34–25 | 60,858 |
| 3 | September 29, 1968 | Dallas Cowboys | L 45–13 | 60,858 |
| 4 | October 6, 1968 | at Washington Redskins | L 17–14 | 50,816 |
| 5 | October 13, 1968 | at Dallas Cowboys | L 34–14 | 72,083 |
| 6 | October 20, 1968 | Chicago Bears | L 29–16 | 60,858 |
| 7 | October 27, 1968 | at Pittsburgh Steelers | L 6–3 | 26,908 |
| 8 | November 3, 1968 | St. Louis Cardinals | L 45–17 | 59,208 |
| 9 | November 10, 1968 | Washington Redskins | L 16–10 | 59,133 |
| 10 | November 17, 1968 | at New York Giants | L 7–6 | 62,896 |
| 11 | November 24, 1968 | at Cleveland Browns | L 47–13 | 62,338 |
| 12 | November 28, 1968 | at Detroit Lions | W 12–0 | 47,909 |
| 13 | December 8, 1968 | New Orleans Saints | W 29–17 | 57,128 |
| 14 | December 15, 1968 | Minnesota Vikings | L 24–17 | 54,530 |
Question:
how many times were the dallas cowboys listed as an opponent?
Answer:
2