(a)in respect of the entries against serial number 6 thereof, if gratuity or gratuities was or were received from one or more than one employer in the same tax year (whether or not any gratuity or gratuities was or were received in any earlier tax year), the aggregate amount of deduction shall not exceed—A – B,where,—A = the limit specified by the Central Government, by notification; andB = the aggregate amount of gratuity or gratuities which was or were received in any one or more earlier tax years and allowed as an exemption or a deduction (whether whole or part) from the total income of any such tax year or years;