McL.2

{U_{4}(3)  ≤ \atop U_{4}(3).2_{3}} 550 1a^{±} + 22a^{±} + 252a^{±}  6

Character Numbers: [ 1, 2, 3, 4, 7, 8 ]

S_{1} S_{2}  S_{3} S_{4} S_{5}  S_{6}
χ_{1} 1 1 112 112 162 162
χ_{2} 1 −1 −112 112 162 −162
χ_{3} 1 1 −28 −28 27  27
χ_{4} 1 −1  28 −28 27 −27
χ_{5} 1 1  2  2 −3 −3
χ_{6} 1 −1 −2  2 −3  3

Ramanujan Graphs: [ 2, 3, 4, 5, 6 ], [ 2, 3, 6 ], [ 3, 4, 5, 6 ], [ 3, 6 ], [ 4, 5 ]