Mort is a book
Philatelic literature is divided into the following categories: Stamp catalogues, Periodicals, Auction catalogues, Books, Bibliographies, and Background Material Mort is not a Stamp catalogue. Mort is not a periodical, auction catalogue, bibliography, or background material. Mort is a piece of Philatelic literature.
∀x (PhilatelicLit(x) → (Stamp(x) ∨ Periodical(x) ∨ Auction(x) ∨ Book(x) ∨ Bibliography(x) ∨ Background(x))) ¬Stamp(mort) ¬(Periodical(mort) ∨ Auction(mort) ∨ Bibliography(mort) ∨ Background(mort)) PhilatelicLit(mort)