 Complete the following phrase:  The 2016 Spa-Francorchamps GP2 and GP3 Series rounds were a pair of motor races that were held on 27 and 28 August 2016 at the Circuit de Spa-Francorchamps in Belgium as part of the GP2 Series and GP3 Series. It was the eighth round of the 2016 GP2 Series and the sixth round of the 2016 GP3 Series. The race weekend supported the 