(a) Where the request requires correction as a consequence of the withdrawal of a designation or of a change made under Rule 92bis, the International Bureau shall make the necessary correction in the record copy and shall notify the applicant and the receiving Office accordingly.
(b) When making a correction under paragraph (a), the International Bureau shall enter, in the margin, the letters "IB." Where the correction involves the deletion or replacement of some matter, the International Bureau shall enclose such matter within square brackets and shall draw a line between the square brackets while still leaving the deleted or replaced matter legible.