(1) The pleas of autrefois acquit, autrefois convict or pardon, may be pleaded together, and shall, if pleaded, be disposed of before the accused person is called on to plead further.
(2) In respect of the pleas of autrefois acquit or autrefois convict, it is sufficient for the accused to state that he or she has been lawfully acquitted or convicted, as the case may be, of the offence charged in the count or counts to which such plea is pleaded.
(3) Where every such plea is disposed of against the accused, he or she shall be allowed to plead not guilty.