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in the case of one or more impairments in physical or mental functions the effects of which are such that the individual’s ability to perform more than one basic activity of daily living is significantly restricted, a medical practitioner has certified in prescribed form that the impairment or impairments are severe and prolonged impairments in physical or mental functions the effects of which are such that the individual’s ability to perform more than one basic activity of daily living is significantly restricted and that the cumulative effect of those restrictions is equivalent to having a marked restriction in the ability to perform a single basic activity of daily living, where the medical practitioner is, in the case of