Every proposition in itself is composed out of ideas in themselves (for simplicity, we will use "proposition" to mean "proposition in itself" and "idea" to refer to an objective idea or idea in itself. Ideas are negatively defined as those parts of a proposition that are themselves not propositions. A proposition consists of at least three ideas, namely: a subject idea, a predicate idea and the copula (i.e. 'has', or another form of "to have"). (Though there are propositions which contain propositions, but we won't take them into consideration right now.)