Mississippi Code
Chapter 15 - Release of Powers of Appointment
§ 91-15-5. Right to release

Unless the instrument creating the power specifically provides to the contrary, the donee of a power, whether now existing or hereafter created, may:
At any time completely release his power.
At any time or times release his power: (one) as to any property which is subject thereto; (two) as to any one or more of the objects thereof; or (three) so as to limit in any other respect the extent to which it may be exercised.

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