a21 := (1,2,4,7)(3,5,9,14)(6,10,16,24)(8,12,19,29)(11,17,26,38)(13,20,31,45)
     (15,22,34,49)(18,27,40,56)(21,32,46,65)(23,35)(28,41,58,79)(30,43,61,84)
     (33,47,67,91)(36,51,71,98)(37,52,44,62)(39,54,75,104)(42,59,81,112)(48,
     68,93,127)(50,69,95,130)(53,73,101,138)(55,76,106,145)(57,77,108,148)(60,
     82,114,155)(63,86,119,162)(64,87,78,109)(66,89,123,167)(70,96,132,177)
     (72,99,136,182)(74,102,140,188)(80,110,151,113)(83,115,157,207)(85,117,
     159,211)(88,121,164,219)(90,124)(92,125,169,226)(94,128)(97,133,126,170)
     (100,137,184,243)(103,141)(105,143,191,252)(107,146,195,257)(111,152,144,
     192)(116,158,209,272)(118,160,213,275)(120,163,217,280)(122,165,221,284)
     (129,173,231,296)(131,175,233,299)(134,179,237,306)(135,180,239,309)(139,
     186,246,225)(142,190,251,323)(147,196)(149,198,260,335)(150,199,261,337)
     (153,202,265,343)(154,203,266,345)(156,205)(161,214,206,269)(166,222,286,
     366)(168,224,289,370)(171,228,292,374)(172,229,294,377)(174,232,297,381)
     (176,234,301,386)(178,236,304,391)(181,240,311,399)(183,241,312,344)(185,
     244,315,405)(187,247,318,409)(189,249,320,410)(193,254)(194,255,328,420)
     (197,259,333,428)(200,262,338,434)(201,263,340,437)(204,267,347,443)(208,
     271,350,447)(210,227,291,372)(212,274,354,451)(215,277)(216,278,358,457)
     (220,282,361,319)(223,287,367,469)(230,295,379,483)(235,302,388,493)(238,
     307,395,501)(242,313,402,506)(245,316,373,279)(250,321,412,517)(253,325,
     417,524)(256,329,422,528)(258,331,425,533)(264,341,438,394)(268,348,445,
     549)(270,349,446,550)(273,352,449,555)(276,355,453,560)(281,359,365,466)
     (283,362,462,569)(285,364,465,421)(288,368,471,579)(290,371,475,585)(293,
     375,479,574)(298,382,486,594)(300,384,489,598)(303,389,495,605)(305,392,
     385,490)(308,396)(310,398,503,616)(314,403,507,621)(317,407,512,488)(322,
     413,408,513)(324,415,521,636)(326,418,526,642)(327,419)(330,423,530,646)
     (332,426,534,548)(334,429,406,510)(336,431,442,546)(339,435,541,658)(342,
     439,433,538)(346,441,545,662)(351,448,553,669)(353,450)(356,454,562,678)
     (357,455,563,468)(360,459,568,684)(363,463,571,687)(369,472,581,695)(376,
     436,542,659)(378,481,589,703)(380,444,547,665)(383,487,596,460)(387,491,
     600,440)(390,496,607,719)(393,499,610,595)(397,502,614,726)(401,504,604,
     716)(404,508,505,618)(411,515,629,737)(414,519,633,744)(416,522,638,747)
     (424,531,648,617)(427,461,527,643)(430,535,651,759)(432,537,654,478)(452,
     558,573,689)(456,564)(458,566,682,787)(464,572,688,794)(467,575,675,779)
     (470,577,692,799)(473,582,696,805)(474,583,698,808)(476,586,700,810)(477,
     587,701,613)(480,552,668,774)(482,590,705,782)(484,591,707,815)(485,592,
     494,603)(492,601,593,709)(497,608,619,728)(498,609,722,826)(500,611,723,
     645)(509,622,730,832)(511,624,570,686)(514,627,734,677)(516,630,739,565)
     (518,631,741,845)(520,634,745,848)(523,639,749,849)(525,640,751,851)(529,
     644,754,855)(532,649,756,856)(536,652,760,860)(539,656,765,865)(540,657,
     767,602)(543,584,615,635)(544,660,768,868)(551,667,773,637)(554,670)(556,
     671,775,876)(557,672,777,877)(559,674)(561,676,781,588)(567,683,789,883)
     (576,691,797,890)(578,693,801,894)(580,694,802,859)(597,712)(599,702)
     (606,718,823,753)(612,724)(620,729,830,867)(623,731,833,748)(625,732,835,
     720)(626,733,837,916)(628,735,840,918)(632,742,846,780)(641,752,853,776)
     (650,757,857,887)(653,761,786,838)(655,763)(663,770,870,931)(664,727,813,
     778)(666,772,873,898)(673,771,871,854)(679,783,879,872)(680,784,880,841)
     (681,785,881,934)(685,791)(690,796,888,704)(697,806)(699,809)(706,814,
     901,947)(708,816,904,950)(710,817,905,951)(711,818)(713,819,792,715)(714,
     820,908,939)(717,821,909,952)(721,824,902,948)(725,828,827,912)(738,842,
     920,957)(743,847,843,891)(750,850,924,946)(755,798,836,829)(762,861)(764,
     863,927,965)(766,866,929,803)(769,869,793,885)(788,882,936,895)(790,884,
     938,917)(800,892,941,913)(804,839,893,942)(807,896,943,969)(811,900)(812,
     897,944,970)(822,910,953,975)(825,911,954,831)(834,864)(844,921,959,979)
     (852,925,963,940)(858,899,945,971)(862,906,919,956)(874,932)(875,907)
     (886,922,960,981)(903,949,972,985)(915,955,977,987)(923,961)(926,964,982,
     988)(928,966,935,930)(933,967,984,980)(958,978)(962,976,983,989)(968,973);