 For the purposes of the book, when a knot has at least one variant (i.e., when two or more knots, at the greatest degree of symmetry for their class, share the same basic structure apart from one or more transposed L-R pairs), the most balanced version is given the standard designation, while the others are labeled as variants, irrespective of qualities such as being self-releasing (coming undone when the narrow end is pulled out).Thus, the more balanced of the two "half-Windsor" knots is given a lower numbering and the name "Half-Windsor", even though the slightly less balanced "co-Half-Windsor" variant is equally known as the "Half-Windsor" in men's style literature, and has the benefit of being self-releasing, and the most common way of tying the Windsor knot is called "co-Windsor 3" by Fink and Mao.However, this is not intended to mark an aesthetic preference for one variant over the other(s); as the authors note in their journal articles, "We do not attempt to distinguish between these knots and their counterparts; this much we leave to the sartorial discretion of the reader."