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the time that is the beginning of the taxation year of a qualifying business of the trust in which less than 50% of the fair market value of the shares of the qualifying business is derived, directly or indirectly, from assets used principally in an active business carried on by one or more qualifying businesses controlled by the trust at both that time and at the beginning of the preceding taxation year of the qualifying business (unless the active business has ceased to be carried on at that time due to the disposition of all the assets that were used to carry on the business in order to satisfy debts owed to creditors of the trust or of the qualifying business).