b21 := (1,2,5,3)(4,7,13,8)(6,10,18,11)(9,15,25,16)(12,19,30,20)(14,22,35,23)
     (17,27,40,28)(21,32,47,33)(24,36,45,31)(26,38,55,39)(29,42,60,43)(34,49,
     69,50)(37,52,73,53)(41,57,81,58)(44,62,87,63)(46,64,88,65)(48,67,93,68)
     (51,71,98,72)(54,75,103,76)(56,78,94,79)(59,82,112,83)(61,85,117,86)(66,
     90,123,91)(70,95,129,96)(74,101,136,102)(77,105,141,106)(80,109,146,110)
     (84,114,154,115)(89,120,163,121)(92,125,168,126)(97,130,175,131)(99,133,
     161,119)(100,134)(104,138,187,139)(107,142,191,143)(108,144,192,145)(111,
     148,197,149)(113,151,202,152)(116,156,207,157)(118,159,212,160)(122,164,
     218,165)(124,166,221,167)(127,170,226,171)(128,172,227,173)(132,177,234,
     178)(135,181,239,182)(137,184,244,185)(140,188,249,189)(147,194,258,195)
     (150,199,264,200)(153,203,269,204)(155,205,272,206)(158,209,277,210)(162,
     215,282,216)(169,223,291,224)(174,229,299,230)(176,231,300,232)(179,236,
     305,237)(180,213,280,238)(183,241,311,242)(186,246,317,247)(190,251,217,
     252)(193,255,331,256)(196,259,334,260)(198,262,339,263)(201,266,343,267)
     (208,274,354,275)(211,278,335,279)(214,281)(219,285,349,271)(220,270,348,
     286)(222,288,368,289)(225,292,373,293)(228,296,379,297)(233,301,384,302)
     (235,303,387,304)(240,308,257,309)(243,312,396,313)(245,315,398,316)(248,
     319,403,320)(250,322,408,323)(253,326,413,327)(254,328,416,329)(261,336,
     314,337)(265,341,430,342)(268,345,435,346)(273,351,395,352)(276,355,448,
     356)(283,360,452,361)(284,362,453,363)(287,366,459,367)(290,370,463,371)
     (294,375,388,376)(295,377,468,374)(298,380,474,381)(306,389,451,359)(307,
     390,485,391)(310,393,332,394)(318,400,497,401)(321,405,503,406)(324,409,
     508,410)(325,411,509,412)(330,417,514,418)(333,420,519,421)(338,424,523,
     425)(340,427,423,428)(344,432,531,433)(347,437,536,438)(350,441,543,442)
     (353,445,548,446)(357,449,482,386)(358,385,481,450)(364,455,558,456)(365,
     457,561,458)(369,461,563,462)(372,465,567,466)(378,467,569,472)(382,476,
     460,477)(383,478,580,479)(392,487,592,488)(397,491,599,492)(399,494,602,
     495)(402,498,607,499)(404,501,612,502)(407,505,616,506)(414,511,573,471)
     (415,470,572,512)(419,516,534,517)(422,521,632,522)(426,525,637,526)(429,
     527,638,528)(431,530,617,507)(434,532,641,533)(436,535)(439,538,646,539)
     (440,540,581,541)(443,544,650,545)(444,546,640,547)(447,550,655,551)(454,
     556,663,557)(464,552,657,565)(469,570,677,571)(473,574,613,575)(475,577,
     683,578)(480,582,686,583)(483,586,693,587)(484,554,659,588)(486,590,696,
     591)(489,594,700,595)(490,596,701,597)(493,564,671,600)(496,604,706,605)
     (500,609,589,610)(504,614,710,615)(510,620,722,621)(513,624,639,529)(515,
     625,727,626)(518,593,698,629)(520,630,731,631)(524,634,603,635)(537,644,
     742,645)(542,648,746,649)(549,652,749,653)(553,633,733,658)(555,660,560,
     661)(559,665,764,666)(562,668,766,669)(566,672,771,673)(568,675,776,676)
     (576,680,694,681)(579,684,784,685)(584,688,787,689)(585,690,772,691)(598,
     703,802,704)(601,705,723,622)(606,708,651,709)(608,711,808,712)(611,715,
     717,716)(618,720,811,721)(619,667,765,719)(623,724,814,725)(627,728,740,
     643)(628,729,799,699)(636,734,726,735)(642,738,824,739)(647,744,830,745)
     (654,750,837,751)(656,753,840,754)(662,758,846,759)(664,761,752,762)(670,
     768,678,769)(674,773,743,774)(679,778,714,779)(682,781,866,782)(687,785,
     871,786)(692,790,875,791)(695,793,713,794)(697,796,878,797)(702,770,858,
     801)(707,804,850,805)(718,798,880,810)(730,816,896,817)(732,819,900,820)
     (736,821,883,803)(737,800,882,822)(741,826,908,827)(747,832,914,833)(748,
     834,915,835)(755,841,920,842)(756,843,921,844)(757,812,890,845)(760,848,
     806,849)(763,852,792,853)(767,855,929,856)(775,862,935,863)(777,857,912,
     831)(780,864,938,865)(783,868,942,869)(788,872,947,873)(789,874,932,860)
     (795,877,917,838)(807,885,953,886)(809,888,956,889)(813,891,851,892)(815,
     894,948,895)(818,897,961,898)(823,903,836,904)(825,906,966,907)(828,909,
     969,910)(829,911,940,867)(839,884,899,918)(847,924,980,925)(854,926,981,
     927)(859,930,965,931)(861,933,982,934)(870,943,989,944)(876,949,937,922)
     (879,905,964,952)(881,951,962,902)(887,955,994,950)(893,958,928,901)(913,
     970,1011,971)(916,973,1013,974)(919,975,1014,976)(923,939,986,978)(936,
     983,1021,984)(941,987,1025,988)(945,991,992,946)(954,996,1004,997)(957,
     1000,1031,1001)(959,1002,1010,968)(960,967,1009,1003)(963,1005,1008,1006)
     (972,1012,1029,993)(977,1015,1034,1016)(979,1017,998,1018)(985,1022,1040,
     1023)(990,999,1027,1028)(995,1030)(1007,1032,1036,1033)(1019,1035,1024,
     1037)(1020,1026,1039,1038);