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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getApplicationKeyByProcessId(self, unProcessId, pchAppKeyBuffer, unAppKeyBufferLen):
 """ Returns the key of the application for the specified Process Id. The buffer should be at least k_unMaxApplicationKeyLength in order to fit the key. """


        fn = self.function_table.getApplicationKeyByProcessId
        result = fn(unProcessId, pchAppKeyBuffer, unAppKeyBufferLen)
        return result