 Complete the following phrase:  The Drivers and Constructors Championships are decided by points, which are awarded according to the place in which a driver classifies at each grand prix. To receive points a racer need not finish the race, but at least 90 of the winners race distance must be completed. Therefore, it is possible for a driver to receive some points even though they retired before the end of the race. In that case the scoring is based on the distance completed in comparison to other drivers. It is also possible for the lower points not to be awarded as at the 