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