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:
| Rank | Heat | Name | Nationality | Time |
| --- | --- | --- | --- | --- |
| 1.0 | 3.0 | Svetlana Varganova Category:Articles with hCards | Soviet Union | 2:29.77 |
| 2.0 | 3.0 | Irena Fleissnerová Category:Articles with hCards | Czechoslovakia | 2:32.79 |
| 3.0 | 4.0 | Lina Kačiušytė Category:Articles with hCards | Soviet Union | 2:33.04 |
| 4.0 | 2.0 | Yuliya Bogdanova Category:Articles with hCards | Soviet Union | 2:33.45 |
| 5.0 | 4.0 | Susanne Nielsson Category:Articles with hCards | Denmark | 2:34.42 |
| 6.0 | 2.0 | Silvia Rinka Category:Articles with hCards | East Germany | 2:34.88 |
| 7.0 | 1.0 | Bettina Löbel Category:Articles with hCards | East Germany | 2:35.31 |
| 8.0 | 1.0 | Ute Geweniger Category:Articles with hCards | East Germany | 2:35.42 |
| 9.0 | 3.0 | Eva-Marie Håkansson Category:Articles with hCards | Sweden | 2:35.64 |
| 10.0 | 4.0 | Ann-Sofi Roos Category:Articles with hCards | Sweden | 2:35.99 |
| 11.0 | 2.0 | Debbie Rudd Category:Articles with hCards | Great Britain | 2:36.32 |
| 12.0 | 1.0 | Margaret Kelly Category:Articles with hCards | Great Britain | 2:37.67 |
| 13.0 | 4.0 | Tanya Dangalakova Category:Articles with hCards | Bulgaria | 2:39.11 |
| 14.0 | 4.0 | Lisa Curry Category:Articles with hCards | Australia | 2:39.42 |
| 15.0 | 4.0 | Brigitte Prass Category:Articles with hCards | Romania | 2:39.90 |
| 16.0 | 3.0 | Odile Bihan Category:Articles with hCards | France | 2:40.55 |
| 17.0 | 4.0 | Sabrina Seminatore Category:Articles with hCards | Italy | 2:41.77 |
| 18.0 | 2.0 | Elke Holtz Category:Articles with hCards | Mexico | 2:42.59 |
| 19.0 | 1.0 | Brigitte Bosmans Category:Articles with hCards | Belgium | 2:42.87 |
| 20.0 | 3.0 | Catherine Bohan Category:Articles with hCards | Ireland | 2:43.30 |
| 21.0 | 1.0 | Annick de Susini Category:Articles with hCards | France | 2:44.03 |
| 22.0 | 2.0 | Gabriella Kindl Category:Articles with hCards | Hungary | 2:44.08 |
| 23.0 | 3.0 | Lynne Tasker Category:Articles with hCards | Zimbabwe | 2:48.86 |
| 24.0 | 2.0 | Hoàng Thị Hoà Category:Articles with hCards | Vietnam | 2:55.94 |
| 25.0 | 1.0 | Nicole Rajoharison Category:Articles with hCards | Madagascar | 3:12.40 |
Question:
what is the nationality when the heat is less than 3 and the time is 2:35.31?
Answer:
East Germany