b21 := (1,3,6)(2,4,8)(5,9,7)(10,13,17)(11,14,19)(12,15,21)(16,22,29)(18,24,32)
     (20,26,35)(23,30,40)(25,33,44)(27,36,48)(28,37,50)(31,41,55)(34,45,60)
     (38,51,66)(39,52,68)(42,56,47)(43,57,74)(46,61,79)(49,63,82)(53,69,89)
     (54,70,91)(58,75,97)(59,76,99)(62,80,104)(64,83,108)(65,84,110)(67,86,
     113)(71,92,120)(72,93,122)(73,94,124)(77,100,131)(78,101,133)(81,105,138)
     (85,111,145)(87,114,148)(88,115,149)(90,117,152)(95,125,159)(96,126,161)
     (98,128,164)(102,134,171)(103,135,172)(106,139,176)(107,140,177)(109,142,
     180)(112,146,185)(116,150,187)(118,153,191)(119,154,192)(121,155,194)
     (123,157,197)(127,162,202)(129,165,206)(130,166,208)(132,168,210)(136,
     173,215)(137,174,217)(141,178,221)(143,181,224)(144,182,160)(147,167,209)
     (151,188,232)(156,195,240)(158,198,244)(163,203,249)(169,211,256)(170,
     212,258)(175,218,264)(179,222,269)(183,226,274)(184,227,276)(186,229,268)
     (189,233,283)(190,234,284)(193,237,288)(196,241,293)(199,245,298)(200,
     246,207)(201,247,300)(204,250,303)(205,251,305)(213,259,314)(214,260,316)
     (219,265,321)(220,266,323)(223,270,326)(225,272,329)(228,277,335)(230,
     279,262)(231,280,339)(235,285,345)(236,286,347)(238,289,351)(239,290,353)
     (242,294,358)(243,295,350)(248,301,361)(252,306,367)(253,307,368)(254,
     308,370)(255,309,372)(257,311,296)(261,317,380)(263,318,382)(267,324,320)
     (271,327,390)(273,330,394)(275,332,397)(278,336,402)(281,340,407)(282,
     341,409)(287,348,417)(291,354,422)(292,355,424)(297,328,391)(299,359,429)
     (302,362,432)(304,364,434)(310,373,439)(312,374,386)(313,375,441)(315,
     377,444)(319,383,450)(322,384,452)(325,387,454)(331,395,463)(333,398,467)
     (334,399,366)(337,403,473)(338,404,475)(342,410,481)(343,411,483)(344,
     412,484)(346,414,487)(349,418,491)(352,420,494)(356,425,405)(357,426,501)
     (360,430,506)(363,433,509)(365,435,511)(369,392,459)(371,437,514)(376,
     442,519)(378,445,471)(379,446,524)(381,448,527)(385,453,533)(388,455,536)
     (389,456,537)(393,460,542)(396,464,546)(400,469,552)(401,470,554)(406,
     476,558)(408,478,561)(413,485,480)(416,488,569)(419,492,574)(421,495,578)
     (423,497,580)(427,502,585)(428,503,587)(431,507,591)(436,512,597)(440,
     516,602)(443,520,606)(447,525,612)(449,528,616)(451,530,619)(457,538,626)
     (458,539,628)(461,504,588)(462,543,633)(465,547,595)(466,548,638)(468,
     550,640)(472,477,559)(474,555,645)(479,562,650)(482,522,608)(486,566,654)
     (489,570,658)(490,571,660)(493,575,665)(496,579,670)(498,581,673)(499,
     582,675)(500,583,565)(505,589,682)(508,592,686)(510,594,689)(513,598,693)
     (515,600,653)(517,603,698)(518,604,699)(521,607,534)(523,609,605)(526,
     613,705)(529,617,611)(531,620,711)(532,621,560)(535,622,714)(540,629,721)
     (541,630,723)(544,634,727)(545,635,729)(549,639,733)(551,641,736)(553,
     643,738)(556,646,741)(557,647,743)(563,651,669)(564,652,747)(567,655,749)
     (568,656,750)(572,661,755)(573,662,756)(576,666,760)(577,667,762)(584,
     677,769)(586,678,771)(590,683,614)(593,687,779)(596,690,783)(599,694,788)
     (601,623,715)(610,703,795)(615,706,799)(618,708,802)(624,716,811)(625,
     717,813)(627,719,815)(631,724,820)(632,725,821)(636,730,696)(637,731,824)
     (642,737,831)(644,739,834)(648,744,839)(649,745,840)(657,751,718)(659,
     752,845)(663,757,848)(664,758,850)(668,753,846)(671,764,855)(672,734,827)
     (674,766,857)(676,768,859)(679,772,863)(680,773,697)(681,774,726)(684,
     776,867)(685,777,868)(688,780,720)(691,784,871)(692,785,872)(695,789,778)
     (700,792,790)(701,793,816)(702,794,876)(704,796,879)(707,800,884)(709,
     803,763)(710,804,886)(712,806,870)(713,807,890)(722,817,895)(728,823,826)
     (732,825,899)(735,828,843)(740,835,908)(742,837,910)(746,841,913)(754,
     798,881)(759,851,920)(761,852,922)(765,832,904)(767,858,927)(770,860,929)
     (775,865,786)(781,805,887)(782,869,933)(787,866,931)(791,874,936)(797,
     880,940)(801,885,943)(808,891,949)(809,854,924)(810,877,842)(812,893,950)
     (814,894,952)(818,896,955)(819,829,902)(822,897,898)(830,903,959)(833,
     905,962)(836,909,967)(838,911,970)(844,914,973)(847,917,921)(849,919,966)
     (853,923,980)(856,926,983)(861,875,937)(862,930,892)(864,925,982)(873,
     935,989)(878,938,993)(882,941,996)(883,888,945)(889,946,999)(900,956,
     1007)(901,957,1009)(906,963,972)(907,964,1015)(912,971,1020)(915,974,
     1022)(916,975,998)(918,977,1025)(928,951,1004)(932,987,1032)(934,947,
     1000)(939,994,1036)(942,969,1018)(948,1001,1039)(953,958,1010)(954,1006,
     1042)(960,1011,1045)(961,1012,1046)(965,1016,1049)(976,1023,978)(979,
     1026,1055)(981,1027,1057)(984,1029,1048)(985,1019,1051)(986,1030,997)
     (988,1033,1061)(990,1024,1054)(991,1028,1034)(992,1035,1002)(995,1008,
     1043)(1005,1041,1062)(1013,1047,1038)(1017,1050,1066)(1021,1052,1037)
     (1031,1058,1067)(1040,1044,1063)(1053,1065,1059)(1056,1068,1070)(1060,
     1069,1064);