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				| 1. | What does Richardson extrapolation do in finite difference schemes? | 
| A. | Add the error estimate to the results of the finest grid | 
| B. | Subtract the error estimate from the results of the finest grid | 
| C. | Add the error estimate to the results of the current grid | 
| D. | Subtract the error estimate from the results of the current grid | 
| Answer» B. Subtract the error estimate from the results of the finest grid | |