M_{12}

M_{11}  12  1a + 11a  2

Character Numbers: [ 1, 2 ]

M_{11}  12  1a + 11b  2

Character Numbers: [ 1, 3 ]

\begin{aligned}& S_{1} & S_{2} \\ χ_{1} & 1 & 11 \\ χ_{2} & 1 & −1 \end{aligned}

Ramanujan Graphs: [ 2 ]