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12. The Supreme Court shall have power upon good cause shown to extend the time prescribed by rule 8, but if the appellant fails to carry out the requirements of that rule within the time therein prescribed or such extended time as such Court may allow upon application made within one month of obtaining leave or, as the case may be, of declaring the intention to appeal, the appeal shall stand dismissed and the Chief Registrar shall endorse the file of the proceedings accordingly and return such file to the Court from which it came.