/ Unless noted otherwise, the volume and page numbers in citations of Kant are taken from
      the Academy edition of his collected works.
        : see https://korpora.zim.uni-duisburg-essen.de/Kant/verzeichnisse-gesamt.html
        : privately cf. `^^Kant.+Critique of pure reason` @ ~/code/WP3/way/wayic/._/sources.brec
    Kant, Immanuel.  1785, 2012.  Groundwork of the metaphysics of morals.  Translated by Mary Gregor
      and Jens Timmermann.  Cambridge University Press.