A_{2} \\
\\
A_{\left(\frac{1}{2}\right)}_{\sqrt{2}} \\
\\
\left(A_{\left(\frac{1}{2}\right)}\right)_{\sqrt{2}} \\
\\
A_{\left(\left(\frac{1}{2}\right)_{\sqrt{2}}\right)} \\
\\
A_{421} + \frac{1}{2} \\
\\
\frac{A_{421}}{2}