There are only three fundamental kinds of relations

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From Triadic Philosophy one of the 100 aphorisms  that make up the initial text Please visit the press  noted above to sample free all Triadic Philosophy texts
12.

This remarkable text is drawn from Joseph Brent,  Charles Sanders Peirce: A Life, Bloomington and Indianapolis 1993, Page 331. "There are only three fundamental kinds of relations: monadic, dyadic and triadic; ... by combining triads, all relations greater than the number  three can be generated; and ... all those of a greater number than three can be reduced to triads. Since, in addition, triads cannot be reduced to dyads, nor dyads to monads, monads, dyads and triads constitute the fundamental categories of relations. At the same time, triads are made up of dyads and monads, and dyads of monads. Hence, in logical order, monads are first, dyads second, and triads third, which gives a second group of relations: first, second, and third. Hypostatic abstraction provides a third group of relations: firstness, secondness, and thirdness, which contain first second and third, which in turn contain monads, dyads, and triads. Altogether, these elements constitute the abstract,formal mathematical categories and relations that constitute the elements of thought." And the remarkable truth: When we move beyond two we enter the realm of Triadic Philosophy.