Alice conveyed Twinoaks Farm "to Barbara, her heirs and assigns, so long as the premises are used for residential and farm purposes, then to Charles and his heirs and assigns." The jurisdiction in which Twinoaks Farm is located has adopted the common law Rule Against Perpetuities unmodified by statute. As a consequence of the conveyance, Alice's interest in Twinoaks Farm is 
nothing. a possibility of reverter. a right of entry for condition broken. a reversion in fee simple absolute