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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 _execCmd(self, cmd, args):
 """Execute command and return result body as list of lines. @param cmd: Command string. @param args: Comand arguments string. @return: Result dictionary. """

        output = self._eslconn.api(cmd, args)
        if output:
            body = output.getBody()
            if body:
                return body.splitlines()
        return None