CME Guarantor will (a) keep and maintain all property material to the conduct of its business (taken as a whole) in good working order and condition, ordinary wear and tear excepted, and (b) maintain, with financially sound and reputable insurance companies, insurance in such amounts and against such risks as are customarily maintained by companies engaged in the same or similar businesses operating in the same or similar locations (it being understood that, to the extent consistent with prudent business practice, a program of self-insurance for first or other loss layers may be utilized), except in the case of (a) or (b) where the failure to do so, individually or in the aggregate, could not reasonably be expected to result in a CME Material Adverse Effect.