the first day of the assessment period in which the Department determines that the amount of the award is to be reduced under Article 31 or 32 of the Order (higher-level or other sanctions) (but see also regulation 104(2))(reduction period to continue where award terminates)),

if the amount of the award of universal credit for the assessment period referred to in paragraph (a) is not reduced in that period, the first day of the next assessment period, or

if the amount of the award for the assessment period referred to in paragraph (a) or (b) is already subject to a reduction because of a previous sanctionable failure, the first day in respect of which the amount of the award is no longer subject to that reduction.