I use Daniel L. Isdell’s Celtic knot font to design my Celtic knots.
I use MS WordArt to warp them into circles.
I am posting a series of pages showing open-ended Celtic knot sections and the resulting circular Celtic knots.
The knots shown below come from two knot sections stacked on top of each other.
It appears that all sections result in two intertwined cords, except for multiples of three. Then they result in multiple intertwined cords.