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where interests in a partnership or shares of the capital stock of a corporation (which interests or shares are referred to in this subparagraph as “equity interests”) are, at any time, property of a non-discretionary trust (within the meaning assigned by subsection 17(15)) or are deemed under this paragraph to be, at any time, property of such a non-discretionary trust, the equity interests are deemed to be owned at that time by each beneficiary under that trust in a proportion equal to that proportion of the equity interests that is of