The slip rule under O 21 r 10 of the Rules of the Supreme Court 1971 (WA) permits correction of a typographical error in a lot number in a possession order where the error is plainly inadvertent and its correction is not a matter on which a real difference of opinion might exist. Section 78B of the Judiciary Act 1903 (Cth) does not apply where the alleged constitutional point is unarguable.
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