sentences:  After the league added four new teams (the Angels and Senators, followed by the Colt .45s and Mets), the bonus rule was reintroduced in 1962.The difference between the new version of the rule and the previous one was that a player had to spend just one full season on the roster instead of two seasons.Franchises were also allowed one exception, a "designated player" who could play in the minor leagues but would still count against the major league team's 25-man active roster.