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:
| Driver | Constructor | Laps | Time/Retired | Grid |
| --- | --- | --- | --- | --- |
| Emerson Fittipaldi | McLaren - Ford | 53.0 | 1:39:26.29 | 5.0 |
| James Hunt | Hesketh - Ford | 53.0 | + 5.91 | 6.0 |
| Carlos Reutemann | Brabham - Ford | 53.0 | + 17.06 | 3.0 |
| Clay Regazzoni | Ferrari | 53.0 | + 35.79 | 7.0 |
| Patrick Depailler | Tyrrell - Ford | 53.0 | + 54.25 | 8.0 |
| Niki Lauda | Ferrari | 53.0 | + 1:19.65 | 4.0 |
| Mark Donohue | Penske - Ford | 52.0 | + 1 Lap | 16.0 |
| Jacky Ickx | Lotus - Ford | 52.0 | + 1 Lap | 18.0 |
| Vittorio Brambilla | March - Ford | 52.0 | + 1 Lap | 12.0 |
| Graham Hill | Lola - Ford | 52.0 | + 1 Lap | 21.0 |
| Jody Scheckter | Tyrrell - Ford | 52.0 | + 1 Lap | 9.0 |
| Tom Pryce | Shadow - Ford | 51.0 | Transmission | 14.0 |
| Rolf Stommelen | Lola - Ford | 51.0 | + 2 Laps | 19.0 |
| Jochen Mass | McLaren - Ford | 50.0 | + 3 Laps | 13.0 |
| Carlos Pace | Brabham - Ford | 46.0 | Engine | 2.0 |
| Arturo Merzario | Williams - Ford | 44.0 | Not Classified | 20.0 |
| Mario Andretti | Parnelli - Ford | 27.0 | Transmission | 10.0 |
| Mike Wilds | BRM | 24.0 | Engine | 22.0 |
| Ronnie Peterson | Lotus - Ford | 15.0 | Engine | 11.0 |
| Jacques Laffite | Williams - Ford | 15.0 | Gearbox | 17.0 |
| Wilson Fittipaldi | Fittipaldi - Ford | 12.0 | Accident | 23.0 |
| John Watson | Surtees - Ford | 6.0 | Disqualified | 15.0 |
| Jean-Pierre Jarier | Shadow - Ford | 0.0 | Transmission | 1.0 |
Question:
I want the constructor for grid less than 20 and Laps of 6
Answer:
Surtees - Ford