The generated group consists of A = [ 1 1 − 1 0 ] , A 2 = [ 0 1 − 1 − 1 ] , A 3 = [ − 1 0 0 − 1 ] , {\displaystyle A = \begin{bmatrix} 1 & 1 \\ -1 & 0 \\ \end{bmatrix},\ A^2 = \begin{bmatrix} 0 & 1 \\ -1 & -1 \\ \end{bmatrix},\ A^3 = \begin{bmatrix} -1 & 0 \\ 0 & -1 \\ \end{bmatrix},\ }
A 4 = [ − 1 − 1 1 0 ] , A 5 = [ 0 − 1 1 1 ] , A 6 = [ 1 0 0 1 ] . {\displaystyle A^4 = \begin{bmatrix} -1 & -1 \\ 1 & 0 \\ \end{bmatrix},\ A^5 = \begin{bmatrix} 0 & -1 \\ 1 & 1 \\ \end{bmatrix},\ A^6 = \begin{bmatrix} 1 & 0 \\ 0 & 1 \\ \end{bmatrix}. }
