(4)
In a case not covered by paragraph (1) or (2)—
(A)
the loan has been repaid in full and, if the Secretary has suffered a loss on the loan, the loss has been paid in full; or
(B)
the Secretary has been released from liability as to the loan and, if the Secretary has suffered a loss on the loan, the loss has been paid in full.
The Secretary may, in any case involving circumstances the Secretary deems appropriate, waive one or more of the conditions prescribed in paragraph (1). The authority of the Secretary under this subsection to exclude an amount of guaranty or insurance housing loan entitlement previously used by a veteran may be exercised only once for that veteran under the authority of paragraph (4).