Fig. 5
From: RNA secondary structure factorization in prime tangles
![Fig. 5](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12859-022-04879-5/MediaObjects/12859_2022_4879_Fig5_HTML.png)
Examples of tangles. a A graphical representation of a tangle in \({\mathcal {B}}_{4}\). Its invariant is \(1:2,3:2',4:3',1':4'\). b \(I_4 = 1:1', 2:2',3:3',4:4'\), the identity tangle for \({\mathcal {B}}_{4}\)