The grantor has directly or indirectly borrowed the corpus or income and has not completely repaid the loan, including any interest, before the beginning of the taxable year. The preceding sentence shall not apply to a loan which provides for adequate interest and adequate security, if such loan is made by a trustee other than the grantor and other than a related or subordinate trustee subservient to the grantor. For periods during which an individual is the spouse of the grantor (within the meaning of section
672
(e)(2)), any reference in this paragraph to the grantor shall be treated as including a reference to such individual.