 Complete the following phrase:  In 1977 Clay Regazzoni raced for Ensign, scoring five points with best finishes of fifth in Italy and America. In 1978 the team entered cars for Danny Ongais and Lamberto Leoni, but Ongais left after two races and Leoni after four races. Jacky Ickx contested the next four races and Derek Daly raced the rest of the season scoring a point in Canada. Also in 1978 Nelson Piquet made his debut in Formula 1 at the 