 Complete the following phrase:  After Duke Xiaos death, King Huiwen became the new ruler of Qin and he put Shang Yang to death by chariot-tearing on charges of treason, but some believed that the king harboured a personal grudge against Shang because he was harshly punished for a minor infraction in his adolescence under Shangs reformed system. However, King Huiwen and his successors retained the reformed systems and they helped to lay the foundation for Qins eventual 