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 |
| --- | --- | --- | --- | --- |
| 1.0 | September 1, 1991 | at Indianapolis Colts | W 16–7 | 49,961 |
| 2.0 | September 8, 1991 | Cleveland Browns | L 20–0 | 35,377 |
| 3.0 | September 15, 1991 | at Pittsburgh Steelers | L 20–6 | 53,703 |
| 4.0 | September 22, 1991 | Houston Oilers | W 24–20 | 30,702 |
| 5.0 | September 29, 1991 | at Phoenix Cardinals | L 24–10 | 26,043 |
| 6.0 | October 6, 1991 | Miami Dolphins | L 20–10 | 49,749 |
| 7.0 | Bye | Bye | Bye | Bye |
| 8.0 | October 20, 1991 | Minnesota Vikings | W 26–23 | 45,367 |
| 9.0 | October 27, 1991 | Denver Broncos | L 9–6 | 43,994 |
| 10.0 | November 3, 1991 | at Buffalo Bills | L 22–17 | 78,278 |
| 11.0 | November 10, 1991 | at Miami Dolphins | L 30–20 | 56,065 |
| 12.0 | November 17, 1991 | New York Jets | L 28–21 | 30,743 |
| 13.0 | November 24, 1991 | Buffalo Bills | W 16–13 | 47,053 |
| 14.0 | December 1, 1991 | at Denver Broncos | L 20–3 | 67,116 |
| 15.0 | December 8, 1991 | Indianapolis Colts | W 23–17 | 20,131 |
| 16.0 | December 15, 1991 | at New York Jets | W 6–3 | 55,689 |
| 17.0 | December 22, 1991 | at Cincinnati Bengals | L 29–7 | 46,394 |
Question:
Who did the Patriots play in week 4?
Answer:
Houston Oilers