Okla. Stat. tit. 60, § 60-175.86: Distribution interest - Mandatory, support, and

discretionary interests.

A. A distribution interest in a trust shall be classified as a

mandatory interest, a support interest or a discretionary interest.

B. A beneficiary may concurrently hold a mandatory interest,

support interest or discretionary interest. To the extent a trust

contains a combination of a discretionary interest, a support

interest or a mandatory interest, the trust shall be a mandatory

interest only to the extent of the mandatory language and a support

interest only to the extent of the support language. The remaining

trust property shall be held as a discretionary interest.