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




print("the normalizer in M22:2 of the defect group C of the blocks 
B_2 and B_3");