"(5) (a) Subject to paragraph (b), the period of disqualification specified in a consequential disqualification order shall, where the person to whom the order relates is convicted of an offence under section 52 or 53 tried summarily or under section 56, be not less than 2 years in the case of a first offence under the section concerned and not less than 4 years in the case of a second or any subsequent offence under the same section committed within the period of 3 years from the date of the commission of the previous offence or, in the case of more than one such offence, the last such offence.

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