M_{22}.2

2^{4} : S_{6}  77 1a^{+} + 21a^{+} + 55a^{+}  3

Character Numbers: [ 1, 3, 9 ]

S_{1} S_{2} S_{3}
χ_{1} 1 16 60
χ_{2} 1 −6 5
χ_{3} 1 2 −3

Ramanujan Graphs: [ 2 ], [ 2, 3 ], [ 3 ]