Regulation 17 of the Principal Regulations is amended as follows:(a) by omitting from subregulation (2)(b) "appropriate." and substituting "appropriate; and" ;(b) by inserting the following paragraph after paragraph (b) in subregulation (2) :(c) contain any additional information the Board considers appropriate.(c) by inserting in subregulation (5) "vary or" after "may" ;(d) by inserting in subregulation (6) "varying or" after "after" ;(e) by inserting in subregulation (6) "variation or" after "of the" ;(f) by omitting subregulation (7) and substituting the following subregulation:(7) Notice of the variation or revocation of an exemption is to specify (a) the details of the variation or revocation; and(b) the day on which the variation or revocation takes effect; and(c) for a notice of the revocation of an exemption, the period during which the person cannot re-apply for the exemption.