b21 := (1,2,3)(4,6,7)(5,8,9)(10,14,15)(12,16,17)(13,18,19)(20,26,27)(21,23,28)
     (22,29,30)(24,31,32)(25,33,34)(35,44,45)(36,46,47)(37,48,49)(38,50,51)
     (39,40,52)(41,53,54)(42,55,56)(43,57,58)(59,73,74)(60,75,76)(61,77,78)
     (62,79,80)(63,81,82)(64,83,84)(65,85,86)(66,87,88)(67,89,90)(68,91,92)
     (69,93,94)(70,95,96)(71,97,98)(72,99,100)(101,129,130)(102,131,132)(103,
     107,133)(104,134,135)(105,136,124)(106,137,138)(108,139,140)(109,141,142)
     (111,143,144)(112,145,146)(113,147,148)(114,149,150)(115,151,152)(116,
     153,154)(117,155,156)(118,157,158)(119,159,160)(120,161,162)(121,163,127)
     (122,164,165)(123,166,167)(125,168,169)(126,170,171)(128,172,173)(174,
     219,220)(175,221,222)(176,223,224)(177,225,226)(178,227,228)(179,229,194)
     (180,230,231)(181,232,233)(182,234,235)(183,236,237)(184,238,239)(185,
     240,241)(186,242,243)(187,244,245)(188,246,247)(189,248,249)(190,250,209)
     (191,251,252)(192,253,254)(193,255,256)(195,211,257)(196,258,216)(197,
     259,260)(198,261,262)(199,263,264)(200,265,266)(201,267,205)(202,268,269)
     (203,270,271)(204,272,273)(206,274,275)(207,276,277)(208,278,279)(210,
     280,281)(213,282,283)(214,284,285)(215,286,287)(217,288,289)(218,290,291)
     (292,359,360)(293,361,296)(294,362,363)(295,364,317)(297,365,366)(298,
     367,368)(299,369,370)(300,371,372)(301,373,374)(302,375,376)(303,323,377)
     (304,378,379)(305,380,381)(306,382,313)(307,383,384)(308,385,386)(309,
     387,388)(310,324,389)(311,390,391)(312,392,393)(314,394,395)(315,330,396)
     (316,397,398)(318,399,400)(319,401,402)(320,403,404)(321,405,406)(322,
     407,332)(325,408,409)(326,410,411)(327,412,413)(328,414,415)(329,416,417)
     (331,358,418)(333,419,420)(334,421,422)(335,423,424)(336,425,346)(337,
     426,427)(338,428,429)(339,430,431)(340,432,433)(341,434,435)(342,436,437)
     (343,438,351)(344,439,440)(345,441,442)(347,443,444)(348,445,446)(349,
     447,448)(350,449,450)(352,451,452)(353,453,454)(354,455,456)(355,457,458)
     (357,459,460)(461,491,548)(462,549,550)(463,534,551)(464,552,553)(465,
     554,555)(466,556,557)(467,558,559)(468,479,560)(470,561,562)(471,492,563)
     (472,564,474)(473,565,566)(475,567,568)(476,569,570)(477,571,518)(478,
     572,573)(480,574,575)(481,576,577)(482,578,579)(483,580,581)(484,496,582)
     (485,583,584)(486,585,586)(487,587,588)(488,589,590)(489,591,592)(490,
     593,594)(493,595,596)(494,597,598)(495,599,600)(497,601,602)(498,603,604)
     (499,514,605)(500,606,607)(501,608,609)(502,610,611)(503,612,613)(504,
     614,615)(505,616,508)(506,617,618)(507,619,513)(509,620,621)(510,622,623)
     (511,624,625)(512,626,627)(515,628,629)(516,630,631)(517,632,633)(519,
     634,635)(520,636,637)(521,638,639)(522,640,641)(523,642,643)(524,644,645)
     (525,646,647)(526,648,649)(527,536,650)(528,651,652)(529,653,654)(530,
     655,656)(531,657,658)(532,659,542)(533,660,661)(535,662,663)(537,664,665)
     (539,666,667)(540,668,669)(541,670,671)(543,672,673)(544,674,675)(545,
     676,677)(546,678,679)(547,680,681)(682,783,784)(683,735,695)(684,745,690)
     (685,717,785)(686,744,748)(687,786,787)(688,773,729)(689,722,788)(691,
     789,731)(692,790,791)(693,792,793)(694,794,765)(696,795,796)(697,702,797)
     (698,798,799)(699,758,708)(700,800,801)(701,802,747)(703,803,804)(704,
     805,806)(705,738,807)(706,808,726)(707,732,718)(709,809,733)(710,810,760)
     (711,715,771)(712,751,811)(713,756,721)(714,812,813)(716,814,741)(719,
     815,816)(720,817,767)(723,818,819)(724,820,821)(725,822,823)(727,824,825)
     (728,764,737)(730,826,827)(734,828,757)(736,829,830)(739,776,831)(740,
     780,832)(742,833,834)(743,835,836)(746,837,838)(749,839,840)(750,841,842)
     (752,843,844)(753,845,846)(754,847,848)(755,849,850)(759,851,852)(761,
     853,854)(762,855,856)(763,857,858)(766,859,860)(768,861,862)(769,863,782)
     (770,864,865)(772,866,867)(774,868,869)(775,870,779)(777,871,872)(778,
     873,781)(874,930,897)(875,931,889)(876,879,911)(877,905,887)(878,932,883)
     (880,933,934)(881,909,886)(882,899,912)(884,935,936)(885,937,938)(888,
     939,896)(890,940,941)(891,942,943)(892,913,908)(893,944,895)(894,914,945)
     (898,946,904)(900,927,947)(901,948,928)(902,949,950)(903,951,952)(906,
     929,922)(907,953,918)(910,954,955)(915,956,957)(916,958,959)(917,960,961)
     (919,921,962)(920,963,924)(925,964,965)(926,966,967)(968,974,969)(970,
     979,972)(971,977,973)(975,980,976);