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:
| Rider | Manufacturer | Laps | Time/Retired | Grid |
| --- | --- | --- | --- | --- |
| Mattia Pasini | Aprilia | 20.0 | 40:16.202 | 5.0 |
| Hector Barbera | Aprilia | 20.0 | +0.557 | 2.0 |
| Mika Kallio | KTM | 20.0 | +1.029 | 4.0 |
| Alex Debon | Aprilia | 20.0 | +1.418 | 1.0 |
| Yuki Takahashi | Honda | 20.0 | +12.944 | 7.0 |
| Alvaro Bautista | Aprilia | 20.0 | +14.480 | 3.0 |
| Karel Abraham | Aprilia | 20.0 | +16.721 | 11.0 |
| Roberto Locatelli | Gilera | 20.0 | +18.987 | 9.0 |
| Aleix Espargaro | Aprilia | 20.0 | +32.232 | 8.0 |
| Hector Faubel | Aprilia | 20.0 | +41.102 | 15.0 |
| Julian Simon | KTM | 20.0 | +41.457 | 14.0 |
| Fabrizio Lai | Gilera | 20.0 | +41.694 | 13.0 |
| Ratthapark Wilairot | Honda | 20.0 | +43.192 | 19.0 |
| Manuel Poggiali | Gilera | 20.0 | +44.228 | 18.0 |
| Thomas Luthi | Aprilia | 20.0 | +48.760 | 10.0 |
| Hiroshi Aoyama | KTM | 20.0 | +1:11.031 | 12.0 |
| Doni Tata Pradita | Yamaha | 20.0 | +2:05.461 | 23.0 |
| Alex Baldolini | Aprilia | 14.0 | Retirement | 17.0 |
| Lukas Pesek | Aprilia | 12.0 | Retirement | 16.0 |
| Marco Simoncelli | Gilera | 7.0 | Retirement | 6.0 |
| Imre Toth | Aprilia | 4.0 | Retirement | 22.0 |
| Manuel Hernandez | Aprilia | 0.0 | Retirement | 21.0 |
| Eugene Laverty | Aprilia | 0.0 | Retirement | 20.0 |
Question:
What kind of  Manufacturer has a Laps smaller than 20 and a Grid of 21
Answer:
Aprilia