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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 create_ssh_tunnel(beaver_config, logger=None):
 """Returns a BeaverSshTunnel object if the current config requires us to"""

    if not beaver_config.use_ssh_tunnel():
        return None

    logger.info("Proxying transport using through local ssh tunnel")
    return BeaverSshTunnel(beaver_config, logger=logger)