MIGRATION - cancellation of visa on character grounds - request for revocation of cancellation decision under s 501CA of the Migration Act 1958 (Cth) - whether Minister misconstrued s 501CA(4) as conferring a discretion to revoke cancellation decision where satisfied of matters referred to in provision - whether revocation decision required to be made by same person as cancellation decision - whether Minister took into consideration material that was outside the scope of material that it was permissible to consider
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