NHC:=PermutationGroup<22|(2, 17)(4, 16)(6, 13)(7, 14)(8, 9)(10, 11)(15, 18)(19, 20),(1, 6)(2, 14)(3, 10)(4, 7)(9, 12)(15, 18)(16, 17)(20, 21), (2, 17)(4, 16)(6, 13)(7, 14)(8, 9)(10, 11)(15, 18)(19, 20), (1, 16, 4)(2, 14, 13)(3, 11, 10)(5, 15, 18)(6, 7, 17)(8, 12, 9), (1, 15, 17)(2, 14, 13)(4, 5, 7)(6, 16, 18)(8, 9, 12)(20, 21, 22), (1, 5)(2, 7)(4, 18)(6, 13)(14, 17)(15, 16)(19, 20)(21, 22)>;


print("the normalizer NHC of a defect group C of the 3-block B_2 of M22
in M22");