Text: Following establishment of this initial mail classification schedule, a 3623(b) provides that the Postal Service may from time to time request that the Commission submit, or the Commission may submit to the Governors on its own initiative, a recommended decision on changes in the mail classification schedule.
Entailment: The initial mail classification schedule may be changed with a 3623(b).
Contradiction: The mail classification schedule, under no circumstances, can be changed.