The 26 notions in alphabetical order may determine a subject and/or an object in a sentence. This is just the simple grammar of a language. Add a verb and we have a full sentence subject predicate object (SPO) as they say in English. In the philosophical sense the subject-object relationship is a bit more complicated. Beyond Aristotle’s objectum and subjectum, we think of Descartes “Cogito ergo sum” as the definition of the self as subject, rather than being an object of God’s will and creation. Kant then forms the couple of object and subject in the sense of objectivity and subjectivity. Pure reasoning is the abstraction of subjectivity to achieve an interpersonal objectivity. The master of dialectic thinking, Hegel, conceives an object as objective conscience and a subject as particular subjectivity. Having defined the extreme points of the spectrum makes you think about a joinder or the synthesis. Freud adds the object as result of sexual impulse. Wittgenstein then introduces a kind of hierarchy into the S/O-relationship. Objects become ultimate elements and indescribable in content as kind of basic notions. This follows the mathematical view of objects as indirect description of a mathematical object through axioms stating the basic principles governing the object and then deduce the logical consequences. Gödel’s incompleteness theorem , however, rejects this claim. This is the basis of, for example, algorithmic testing whether deductions are true or false. Condensed mathematics has relied on this testing approach as well.
A pragmatic perspective is added by Marie Gautier (p.719 “Notions”). If we want to reach an objective, we shall need others to realize it. By way of this imagination the S/O-relationship turns into an interactive relationship. Following Habermas, we might claim that the S/O-relationship is also a part of communicative action and therefore the discourse ethics. The definition of who or what is object and/or subject needs open discourse. The arena is not only the parliament, but larger audiences or the world wide web. Beware of the Luhmann systems theory, whereby for example the definition of what is a technical object is, is left to technicians, who then ponder in their self-reflective, reflexive circles amongst themselves. Techniciens in their circles tend to neglect the prime importance of society and laws to determine technological choices. Language with its constituent elements of subject, predicate and object (SPO) is one example of a knowledge system build on axioms or negotiated conventions for grasping and exchanging about phenomena. Nice, now we play around with it.
SPO => OPS. 
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