I am using the braids package (https://www.ctan.org/pkg/braids) by Andrew Stacey to draw braid diagrams with TikZ. With this package, the braid is specified by a braid word. However, I haven't found a way to add identities to the braid, i.e. to space out different components of the braid word, like e.g. in the middle part of the left diagram (which is from the package documentation):
At the moment I have the diagram on the right, corresponding to the code
\documentclass[a4paper]{scrartcl}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.13}
\usepackage{braids}
\begin{document}
\begin{tikzpicture}
\braid[number of strands=4] (braid) a_2 a_3 a_3 a_2;
\end{tikzpicture}
\end{document}
Is there a way to add a specified (arbitrary) amount of space between the two a_3? More generally, how can I add arbitrary space (= identity maps) before or after any crossing in a braid diagram?