Then, if the individuals of the pair are together two, they must be
severally one?

Clearly.

And if each of them is one, then by the addition of any one to any pair,
the whole becomes three?

Yes.

And three are odd, and two are even?

Of course.

And if there are two there must also be twice, and if there are three there
must be thrice; that is, if twice one makes two, and thrice one three?

Certainly.

There are two, and twice, and therefore there must be twice two; and there
are three, and there is thrice, and therefore there must be thrice three?

Of course.

If there are three and twice, there is twice three; and if there are
two and thrice, there is thrice two?

Undoubtedly.