 Complete the following phrase:  The club enjoyed their most success under legendary Austrian manager Ernst Happel as he led the club to three straight league championships from 197576 to 197778 and a Belgian Cup victory in 197677. Happel also guided Club Brugge to their first European final, reaching the 1976 UEFA Cup Final. Over the two-legged final against English giants Liverpool, Club Brugge fell 34 on aggregate. Two years later, Brugge again met Liverpool in a European final, this time in the 