Thanks for the links. I memorised a number of decorative knots as a kid, but it never really occurred to me then that they were formed of smaller parts. That di

Thanks for the links. I memorised a number of decorative knots as a kid, but it never really occurred to me then that they were formed of smaller parts. That didn’t seem to be necessary at the time. Also, you do have prime knots, which are not decomposable in a certain way.