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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 get_trusted_subjects():
 """Get set of subjects that have unlimited access to all SciObj and APIs on this node."""

    cert_subj = _get_client_side_certificate_subject()
    return (
        d1_gmn.app.node_registry.get_cn_subjects()
        | django.conf.settings.DATAONE_TRUSTED_SUBJECTS
        | {cert_subj}
        if cert_subj is not None
        else set()
    )