g := PSL(2,11); invols := [ [g| (1, 9)(2, 5)(3, 12)(4, 8)(6, 7)(10, 11) , (1, 5)(2, 7)(3, 10)(4, 12)(6, 8)(9, 11) , (1, 6)(2, 8)(3, 10)(4, 5)(7, 9)(11, 12) ], [g| (1, 5)(2, 3)(4, 7)(6, 9)(8, 12)(10, 11) , (1, 5)(2, 7)(3, 10)(4, 12)(6, 8)(9, 11) , (1, 10)(2, 4)(3, 7)(5, 11)(6, 8)(9, 12) ], [g| (1, 5)(2, 7)(3, 10)(4, 12)(6, 8)(9, 11) , (1, 8)(2, 3)(4, 11)(5, 7)(6, 12)(9, 10) , (1, 3)(2, 9)(4, 6)(5, 10)(7, 11)(8, 12) ], [g| (1, 3)(2, 9)(4, 6)(5, 10)(7, 11)(8, 12) , (1, 10)(2, 4)(3, 7)(5, 11)(6, 8)(9, 12) , (1, 5)(2, 7)(3, 10)(4, 12)(6, 8)(9, 11) , (1, 4)(2, 10)(3, 6)(5, 9)(7, 8)(11, 12) ] ];