Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| rider | manufacturer | laps | time | grid |
| valentino rossi | yamaha | 32 | 44:04.311 | 2 |
| casey stoner | ducati | 32 | + 13.001 | 1 |
| chris vermeulen | suzuki | 32 | + 26.609 | 8 |
| andrea dovizioso | honda | 32 | + 34.901 | 9 |
| nicky hayden | honda | 32 | + 35.663 | 3 |
| randy de puniet | honda | 32 | + 37.668 | 6 |
| toni elias | ducati | 32 | + 41.629 | 10 |
| ben spies | suzuki | 32 | + 41.927 | 13 |
| james toseland | yamaha | 32 | + 43.019 | 5 |
| shinya nakano | honda | 32 | + 44.391 | 12 |
| jamie hacking | kawasaki | 32 | + 46.258 | 17 |
| sylvain guintoli | ducati | 32 | + 55.273 | 14 |
| alex de angelis | honda | 32 | + 55.521 | 16 |
| colin edwards | yamaha | 32 | + 1:02.380 | 7 |
| loris capirossi | suzuki | 32 | + 1:08.207 | 11 |
| marco melandri | ducati | 32 | + 1:10.962 | 15 |
| anthony west | kawasaki | 31 | + 1 lap | 18 |
| jorge lorenzo | yamaha | 0 | accident | 4 |
Title:
2008 united states motorcycle grand prix
Statement:
if the manufacturer is yamaha , the average of all grid sizes is 4.0
Answer:
refuted