Look at the diagrams in the first section of the article at http://en.wikipedia.org/wiki/Braid_group ! A twist is different from a cross (we could have told them that!). A twist followed by a cross undoes the initial twist (yup).
Take a look even if you are allergic to math. The diagrams alone are worth it. Nancy - To unsubscribe send email to majord...@arachne.com containing the line: unsubscribe lace y...@address.here. For help, write to arachnemodera...@yahoo.com
