The Bonds for each Program shall be secured by the portfolio of mortgages originated under the Program , or mortgage-backed securities covering such mortgages, and such additional security, including security other than the mortgages or mortgage-backed securities with respect to the particular Program , in such form as the Trustees may determine to be required by market conditions prevalent at the time the Program is being developed and as may be determined by the Trustees at the discretion of the Trustees at time of finalization of the Program .
Okla. Admin. Code § 330:15-9-1