b11 := (1,2)(3,5)(6,9)(7,11)(8,13)(10,16)(12,18)(14,20)(15,22)(17,25)(19,28)
     (21,31)(23,33)(24,35)(26,37)(27,39)(29,42)(30,44)(32,47)(34,50)(36,52)
     (38,41)(40,55)(43,59)(45,61)(46,63)(48,66)(49,68)(51,71)(53,73)(54,75)
     (56,78)(57,64)(60,80)(62,81)(65,83)(67,86)(69,74)(70,89)(72,92)(76,95)
     (77,97)(79,100)(85,104)(87,107)(88,109)(90,111)(91,112)(93,114)(94,102)
     (96,116)(99,119)(101,121)(105,124)(106,126)(108,129)(110,120)(113,133)
     (115,132)(117,118)(122,137)(123,139)(125,142)(128,130)(131,146)(134,148)
     (135,149)(138,150)(140,152)(141,153)(143,156)(144,151)(147,154)(155,165)
     (157,159)(163,166)(164,169)(167,168)(171,173)(172,174);