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12Rules may make provision—
(a)that a party who has brought an appeal may not withdraw it without the leave of—
(i)the tribunal, or
(ii)in specified circumstances, the President or the Registrar;
(b)for the tribunal to grant leave to withdraw the appeal on such conditions as it considers appropriate;
(c)enabling the tribunal to publish any decision which it could have made had the appeal not been withdrawn;
(d)as to the effect of withdrawal of an appeal;
(e)as to any procedure to be followed if parties to proceedings on an appeal agree to settle.