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(4) Definitions.  "Occupied structure" means any structure, vehicle or place adapted for overnight accommodation of persons, or for carrying on business therein, whether or not a person is actually present.  Property is that of another, for the purposes of this section, if anyone other than the actor has a possessory or proprietory interest therein.  If a building or structure is divided into separately occupied units, any unit not occupied by the actor is an occupied structure of another.