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:
| Game | Date | Opponent | Score | Record |
| --- | --- | --- | --- | --- |
| 24.0 | 12/1/1973 | Seattle SuperSonics | 120 - 110 | 13 - 11 |
| 25.0 | 12/5/1973 | at Kansas City Kings | 105 - 117 | 13 - 12 |
| 26.0 | 12/7/1973 | at Boston Celtics | 112 - 116 | 13 - 13 |
| 27.0 | 12/8/1973 | at New York Knicks | 100 - 117 | 13 - 14 |
| 28.0 | 12/11/1973 | Buffalo Braves | 127 - 132 | 13 - 15 |
| 29.0 | 12/15/1973 | at Milwaukee Bucks | 82 - 116 | 13 - 16 |
| 30.0 | 12/18/1973 | at Capital Bullets | 98 - 91 | 14 - 16 |
| 31.0 | 12/19/1973 | New York Knicks | 107 - 105 | 15 - 16 |
| 32.0 | 12/21/1973 | at Houston Rockets | 124 - 110 | 16 - 16 |
| 33.0 | 12/22/1973 | Cleveland Cavaliers | 98 - 108 | 16 - 17 |
| 34.0 | 12/26/1973 | Philadelphia 76ers | 145 - 118 | 17 - 17 |
| 35.0 | 12/28/1973 | at Chicago Bulls | 94 - 118 | 17 - 18 |
| 36.0 | 12/29/1973 | Houston Rockets | 114 - 110 | 18 - 18 |
| 37.0 | 12/30/1973 | at Cleveland Cavaliers | 99 - 94 | 19 - 18 |
Question:
Who did the Hawks play on 12/21/1973?
Answer:
at Houston Rockets