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 13, 1964 | at San Francisco 49ers | W 26-17 | 33204.0 |
| 2.0 | September 19, 1964 | at Los Angeles Rams | T 17-17 | 52001.0 |
| 3.0 | September 28, 1964 | Green Bay Packers | L 14-10 | 59203.0 |
| 4.0 | October 4, 1964 | New York Giants | W 26-3 | 54836.0 |
| 5.0 | October 11, 1964 | at Minnesota Vikings | W 24-20 | 40840.0 |
| 6.0 | October 18, 1964 | at Chicago Bears | W 10-0 | 47567.0 |
| 7.0 | October 25, 1964 | Baltimore Colts | L 34-0 | 57814.0 |
| 8.0 | November 1, 1964 | Los Angeles Rams | W 37-17 | 52064.0 |
| 9.0 | November 8, 1964 | at Green Bay Packers | L 30-7 | 42327.0 |
| 10.0 | November 15, 1964 | at Cleveland Browns | L 37-21 | 83064.0 |
| 11.0 | November 22, 1964 | Minnesota Vikings | T 23-23 | 48291.0 |
| 12.0 | November 26, 1964 | Chicago Bears | L 27-24 | 52231.0 |
| 13.0 | December 6, 1964 | at Baltimore Colts | W 31-14 | 60213.0 |
| 14.0 | December 13, 1964 | San Francisco 49ers | W 24-7 | 41854.0 |
Question:
What opponent has December 6, 1964 as the date?
Answer:
at Baltimore Colts