 Complete the following phrase:  Since its re-introduction and till the end of the season, the 107 rule has been broken a further 16 times at 11 different races, exclusively by HRT, Caterham, and VirginMarussia drivers. Unlike the rules first period of application, where infringing drivers were very rarely allowed to compete, only four of these occurrences of the rule violation resulted in the drivers being barred from the race. These were Vitantonio Liuzzi and Narain Karthikeyan at the 2011 Australian Grand Prix, and Pedro de la Rosa and Karthikeyan at the 2012 Australian Grand Prix  all of whom drove for HRT. At the 