Okla. Stat. tit. 60, § 60-175.42
Designation of person to whom property shall belong on
failure or termination of trust - Transfer subject to trust.
Notwithstanding anything contained in the last section, the
trustor of a trust may, in its creation, prescribe to whom the real
or personal property to which the trust relates shall belong, in the
event of the failure or termination of the trust, and may transfer
or devise such property, subject to the execution of the trust.