; and (B) may also be demonstrated through reading and listening in both languages. (2) Inclusion of Native American languages Notwithstanding paragraph (1), each Seal of Biliteracy program shall contain provisions allowing the use of Native American languages, including allowing speakers of any Native American language recognized as official by any American government, including any Tribal government, to use equivalent proficiency in speaking, reading, and writing in the Native American language in lieu of proficiency in speaking, reading, and writing in English. (3) Duration A grant awarded under this section shall be for a period of 2 years, and may be renewed at the discretion of the Secretary. (4) Renewal At the end of a grant term, a State that receives a grant under this section may reapply for a grant under this section. (5) Limitations A State shall not receive more than 1 grant under this section at any time. (6) Return of unspent grant funds Each State that receives a grant under this section shall return any unspent grant funds not later than 6 months after the date on which the term for the grant ends. (b) Grant program A State that desires a grant under this section shall submit an application to the Secretary at such time, in such manner, and containing such information and assurances as the Secretary may require, including— (1) a description of the criteria a student must meet to demonstrate proficiency for the State Seal of Biliteracy in both languages, which— (A) shall include proficiency criteria for the 2 productive skills of speaking and writing; and (B) may include proficiency criteria for the skills of reading and listening; (2) a detailed description of the State’s plan— (A) to ensure that English learners and former English learners are included in the State Seal of Biliteracy program