Section 354.0 - Applicability; maintenance of Sallie Mae Securities(a) A Sallie Mae Security may be maintained in the form of a Definitive Sallie Mae Security or a Book-entry Sallie Mae Security. A Book-entry Sallie Mae Security shall be maintained in the Book-entry System.(b) The Sallie Mae Securities to which the regulations in this part apply are obligations which, by the terms of their issue, are available exclusively as Book-entry Sallie Mae Securities or which, pursuant to the securities documentation, are convertible from Book-entry Sallie Mae Securities to Definitive Sallie Mae Securities or vice versa.