§88-212 Federal-state agreement. The state agency, with the approval of the governor, may enter on behalf of the State into an agreement with the Secretary of Health and Human Services, consistent with the terms and provisions of this part, for the purpose of extending the benefits of the federal old age and survivors insurance system to employees of the State or any political subdivision thereof with respect to services specified in the agreement which constitute "employment" as defined in section 88-211. The agreement may contain such provisions relating to coverage, benefits, contributions, effective date, modification, and termination of the agreement, administration, and other appropriate provisions as the state agency and Secretary of Health and Human Services, shall agree upon, but, except as may be otherwise required by or under the Social Security Act as to the services to be covered, the agreement shall provide in effect that: