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 |
| --- | --- | --- | --- | --- |
| Niki Lauda | Ferrari | 54.0 | 1:40:18.84 | 1.0 |
| James Hunt | Hesketh - Ford | 54.0 | + 1.59 | 3.0 |
| Jochen Mass | McLaren - Ford | 54.0 | + 2.31 | 7.0 |
| Emerson Fittipaldi | McLaren - Ford | 54.0 | + 39.77 | 10.0 |
| Mario Andretti | Parnelli - Ford | 54.0 | + 1:02.08 | 15.0 |
| Patrick Depailler | Tyrrell - Ford | 54.0 | + 1:07.40 | 13.0 |
| Tony Brise | Hill - Ford | 54.0 | + 1:09.61 | 12.0 |
| Jean-Pierre Jarier | Shadow - Ford | 54.0 | + 1:19.78 | 4.0 |
| Jody Scheckter | Tyrrell - Ford | 54.0 | + 1:31.68 | 2.0 |
| Ronnie Peterson | Lotus - Ford | 54.0 | + 1:36.02 | 17.0 |
| Jacques Laffite | Williams - Ford | 54.0 | + 1:36.77 | 16.0 |
| Jean-Pierre Jabouille | Tyrrell - Ford | 54.0 | + 1:37.13 | 21.0 |
| John Watson | Surtees - Ford | 53.0 | + 1 Lap | 14.0 |
| Carlos Reutemann | Brabham - Ford | 53.0 | + 1 Lap | 11.0 |
| Gijs Van Lennep | Ensign - Ford | 53.0 | + 1 Lap | 22.0 |
| Alan Jones | Hill - Ford | 53.0 | + 1 Lap | 20.0 |
| Bob Evans | BRM | 52.0 | + 2 Laps | 25.0 |
| Lella Lombardi | March - Ford | 50.0 | + 4 Laps | 26.0 |
| Carlos Pace | Brabham - Ford | 26.0 | Transmission | 5.0 |
| Jacky Ickx | Lotus - Ford | 17.0 | Brakes | 19.0 |
| Wilson Fittipaldi | Fittipaldi - Ford | 14.0 | Engine | 23.0 |
| Vittorio Brambilla | March - Ford | 6.0 | Chassis | 8.0 |
| Clay Regazzoni | Ferrari | 6.0 | Engine | 9.0 |
| Mark Donohue | Penske - Ford | 6.0 | Transmission | 18.0 |
| Tom Pryce | Shadow - Ford | 2.0 | Transmission | 6.0 |
| François Migault | Williams - Ford | 0.0 | Non Starter | 24.0 |
Question:
what is the time/retired when the laps is 6, the grid is less than 18 and the driver is clay regazzoni?
Answer:
Engine