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specified right, at any time in respect of a property, means a right to, at that time, mortgage, hypothecate, assign, pledge or in any way encumber the property to secure payment of an obligation — other than the particular debt or other obligation described in paragraph (6)(a) or a debt or other obligation described in subparagraph (6)(d)(ii) — or to use, invest, sell or otherwise dispose of, or in any way alienate, the property unless it is established by the taxpayer that all of the proceeds (net of costs, if any) received, or that would be received, from exercising the right must first be applied to reduce an amount described in subparagraph (6)(d)(i) or (ii); (droit déterminé)