Play with this polytope as a twisty puzzle
This page is part of the Atlas of Small Regular Polytopess0 := ( 1,289)( 2,290)( 3,291)( 4,292)( 5,293)( 6,294)( 7,295)( 8,296)( 9,297)( 10,298)( 11,299)( 12,300)( 13,301)( 14,302)( 15,303)( 16,304)( 17,305)( 18,306)( 19,316)( 20,317)( 21,318)( 22,319)( 23,320)( 24,321)( 25,322)( 26,323)( 27,324)( 28,307)( 29,308)( 30,309)( 31,310)( 32,311)( 33,312)( 34,313)( 35,314)( 36,315)( 37,334)( 38,335)( 39,336)( 40,337)( 41,338)( 42,339)( 43,340)( 44,341)( 45,342)( 46,325)( 47,326)( 48,327)( 49,328)( 50,329)( 51,330)( 52,331)( 53,332)( 54,333)( 55,343)( 56,344)( 57,345)( 58,346)( 59,347)( 60,348)( 61,349)( 62,350)( 63,351)( 64,352)( 65,353)( 66,354)( 67,355)( 68,356)( 69,357)( 70,358)( 71,359)( 72,360)( 73,379)( 74,380)( 75,381)( 76,382)( 77,383)( 78,384)( 79,385)( 80,386)( 81,387)( 82,388)( 83,389)( 84,390)( 85,391)( 86,392)( 87,393)( 88,394)( 89,395)( 90,396)( 91,361)( 92,362)( 93,363)( 94,364)( 95,365)( 96,366)( 97,367)( 98,368)( 99,369)(100,370)(101,371)(102,372)(103,373)(104,374)(105,375)(106,376)(107,377)(108,378)(109,424)(110,425)(111,426)(112,427)(113,428)(114,429)(115,430)(116,431)(117,432)(118,415)(119,416)(120,417)(121,418)(122,419)(123,420)(124,421)(125,422)(126,423)(127,406)(128,407)(129,408)(130,409)(131,410)(132,411)(133,412)(134,413)(135,414)(136,397)(137,398)(138,399)(139,400)(140,401)(141,402)(142,403)(143,404)(144,405)(145,433)(146,434)(147,435)(148,436)(149,437)(150,438)(151,439)(152,440)(153,441)(154,442)(155,443)(156,444)(157,445)(158,446)(159,447)(160,448)(161,449)(162,450)(163,460)(164,461)(165,462)(166,463)(167,464)(168,465)(169,466)(170,467)(171,468)(172,451)(173,452)(174,453)(175,454)(176,455)(177,456)(178,457)(179,458)(180,459)(181,478)(182,479)(183,480)(184,481)(185,482)(186,483)(187,484)(188,485)(189,486)(190,469)(191,470)(192,471)(193,472)(194,473)(195,474)(196,475)(197,476)(198,477)(199,487)(200,488)(201,489)(202,490)(203,491)(204,492)(205,493)(206,494)(207,495)(208,496)(209,497)(210,498)(211,499)(212,500)(213,501)(214,502)(215,503)(216,504)(217,523)(218,524)(219,525)(220,526)(221,527)(222,528)(223,529)(224,530)(225,531)(226,532)(227,533)(228,534)(229,535)(230,536)(231,537)(232,538)(233,539)(234,540)(235,505)(236,506)(237,507)(238,508)(239,509)(240,510)(241,511)(242,512)(243,513)(244,514)(245,515)(246,516)(247,517)(248,518)(249,519)(250,520)(251,521)(252,522)(253,568)(254,569)(255,570)(256,571)(257,572)(258,573)(259,574)(260,575)(261,576)(262,559)(263,560)(264,561)(265,562)(266,563)(267,564)(268,565)(269,566)(270,567)(271,550)(272,551)(273,552)(274,553)(275,554)(276,555)(277,556)(278,557)(279,558)(280,541)(281,542)(282,543)(283,544)(284,545)(285,546)(286,547)(287,548)(288,549);; s1 := ( 2, 3)( 4, 9)( 5, 8)( 6, 7)( 11, 12)( 13, 18)( 14, 17)( 15, 16)( 19, 28)( 20, 30)( 21, 29)( 22, 36)( 23, 35)( 24, 34)( 25, 33)( 26, 32)( 27, 31)( 38, 39)( 40, 45)( 41, 44)( 42, 43)( 47, 48)( 49, 54)( 50, 53)( 51, 52)( 55, 64)( 56, 66)( 57, 65)( 58, 72)( 59, 71)( 60, 70)( 61, 69)( 62, 68)( 63, 67)( 73, 91)( 74, 93)( 75, 92)( 76, 99)( 77, 98)( 78, 97)( 79, 96)( 80, 95)( 81, 94)( 82,100)( 83,102)( 84,101)( 85,108)( 86,107)( 87,106)( 88,105)( 89,104)( 90,103)(109,127)(110,129)(111,128)(112,135)(113,134)(114,133)(115,132)(116,131)(117,130)(118,136)(119,138)(120,137)(121,144)(122,143)(123,142)(124,141)(125,140)(126,139)(145,181)(146,183)(147,182)(148,189)(149,188)(150,187)(151,186)(152,185)(153,184)(154,190)(155,192)(156,191)(157,198)(158,197)(159,196)(160,195)(161,194)(162,193)(163,208)(164,210)(165,209)(166,216)(167,215)(168,214)(169,213)(170,212)(171,211)(172,199)(173,201)(174,200)(175,207)(176,206)(177,205)(178,204)(179,203)(180,202)(217,271)(218,273)(219,272)(220,279)(221,278)(222,277)(223,276)(224,275)(225,274)(226,280)(227,282)(228,281)(229,288)(230,287)(231,286)(232,285)(233,284)(234,283)(235,253)(236,255)(237,254)(238,261)(239,260)(240,259)(241,258)(242,257)(243,256)(244,262)(245,264)(246,263)(247,270)(248,269)(249,268)(250,267)(251,266)(252,265)(289,361)(290,363)(291,362)(292,369)(293,368)(294,367)(295,366)(296,365)(297,364)(298,370)(299,372)(300,371)(301,378)(302,377)(303,376)(304,375)(305,374)(306,373)(307,388)(308,390)(309,389)(310,396)(311,395)(312,394)(313,393)(314,392)(315,391)(316,379)(317,381)(318,380)(319,387)(320,386)(321,385)(322,384)(323,383)(324,382)(325,397)(326,399)(327,398)(328,405)(329,404)(330,403)(331,402)(332,401)(333,400)(334,406)(335,408)(336,407)(337,414)(338,413)(339,412)(340,411)(341,410)(342,409)(343,424)(344,426)(345,425)(346,432)(347,431)(348,430)(349,429)(350,428)(351,427)(352,415)(353,417)(354,416)(355,423)(356,422)(357,421)(358,420)(359,419)(360,418)(433,550)(434,552)(435,551)(436,558)(437,557)(438,556)(439,555)(440,554)(441,553)(442,541)(443,543)(444,542)(445,549)(446,548)(447,547)(448,546)(449,545)(450,544)(451,559)(452,561)(453,560)(454,567)(455,566)(456,565)(457,564)(458,563)(459,562)(460,568)(461,570)(462,569)(463,576)(464,575)(465,574)(466,573)(467,572)(468,571)(469,514)(470,516)(471,515)(472,522)(473,521)(474,520)(475,519)(476,518)(477,517)(478,505)(479,507)(480,506)(481,513)(482,512)(483,511)(484,510)(485,509)(486,508)(487,523)(488,525)(489,524)(490,531)(491,530)(492,529)(493,528)(494,527)(495,526)(496,532)(497,534)(498,533)(499,540)(500,539)(501,538)(502,537)(503,536)(504,535);; s2 := ( 1,148)( 2,150)( 3,149)( 4,145)( 5,147)( 6,146)( 7,153)( 8,152)( 9,151)( 10,157)( 11,159)( 12,158)( 13,154)( 14,156)( 15,155)( 16,162)( 17,161)( 18,160)( 19,166)( 20,168)( 21,167)( 22,163)( 23,165)( 24,164)( 25,171)( 26,170)( 27,169)( 28,175)( 29,177)( 30,176)( 31,172)( 32,174)( 33,173)( 34,180)( 35,179)( 36,178)( 37,184)( 38,186)( 39,185)( 40,181)( 41,183)( 42,182)( 43,189)( 44,188)( 45,187)( 46,193)( 47,195)( 48,194)( 49,190)( 50,192)( 51,191)( 52,198)( 53,197)( 54,196)( 55,202)( 56,204)( 57,203)( 58,199)( 59,201)( 60,200)( 61,207)( 62,206)( 63,205)( 64,211)( 65,213)( 66,212)( 67,208)( 68,210)( 69,209)( 70,216)( 71,215)( 72,214)( 73,229)( 74,231)( 75,230)( 76,226)( 77,228)( 78,227)( 79,234)( 80,233)( 81,232)( 82,220)( 83,222)( 84,221)( 85,217)( 86,219)( 87,218)( 88,225)( 89,224)( 90,223)( 91,247)( 92,249)( 93,248)( 94,244)( 95,246)( 96,245)( 97,252)( 98,251)( 99,250)(100,238)(101,240)(102,239)(103,235)(104,237)(105,236)(106,243)(107,242)(108,241)(109,265)(110,267)(111,266)(112,262)(113,264)(114,263)(115,270)(116,269)(117,268)(118,256)(119,258)(120,257)(121,253)(122,255)(123,254)(124,261)(125,260)(126,259)(127,283)(128,285)(129,284)(130,280)(131,282)(132,281)(133,288)(134,287)(135,286)(136,274)(137,276)(138,275)(139,271)(140,273)(141,272)(142,279)(143,278)(144,277)(289,436)(290,438)(291,437)(292,433)(293,435)(294,434)(295,441)(296,440)(297,439)(298,445)(299,447)(300,446)(301,442)(302,444)(303,443)(304,450)(305,449)(306,448)(307,454)(308,456)(309,455)(310,451)(311,453)(312,452)(313,459)(314,458)(315,457)(316,463)(317,465)(318,464)(319,460)(320,462)(321,461)(322,468)(323,467)(324,466)(325,472)(326,474)(327,473)(328,469)(329,471)(330,470)(331,477)(332,476)(333,475)(334,481)(335,483)(336,482)(337,478)(338,480)(339,479)(340,486)(341,485)(342,484)(343,490)(344,492)(345,491)(346,487)(347,489)(348,488)(349,495)(350,494)(351,493)(352,499)(353,501)(354,500)(355,496)(356,498)(357,497)(358,504)(359,503)(360,502)(361,517)(362,519)(363,518)(364,514)(365,516)(366,515)(367,522)(368,521)(369,520)(370,508)(371,510)(372,509)(373,505)(374,507)(375,506)(376,513)(377,512)(378,511)(379,535)(380,537)(381,536)(382,532)(383,534)(384,533)(385,540)(386,539)(387,538)(388,526)(389,528)(390,527)(391,523)(392,525)(393,524)(394,531)(395,530)(396,529)(397,553)(398,555)(399,554)(400,550)(401,552)(402,551)(403,558)(404,557)(405,556)(406,544)(407,546)(408,545)(409,541)(410,543)(411,542)(412,549)(413,548)(414,547)(415,571)(416,573)(417,572)(418,568)(419,570)(420,569)(421,576)(422,575)(423,574)(424,562)(425,564)(426,563)(427,559)(428,561)(429,560)(430,567)(431,566)(432,565);; poly := Group([s0,s1,s2]);;Finitely Presented Group Representation (GAP) :
F := FreeGroup("s0","s1","s2");;
s0 := F.1;; s1 := F.2;; s2 := F.3;;
rels := [ s0*s0, s1*s1, s2*s2, s0*s2*s0*s2, s0*s1*s2*s1*s2*s0*s1*s0*s1*s2*s1*s2*s0*s1,
s0*s1*s0*s1*s0*s1*s2*s1*s0*s1*s0*s1*s0*s1*s2*s1,
s0*s1*s0*s1*s2*s0*s1*s0*s1*s0*s2*s1*s0*s1*s0*s1*s0*s1,
s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2 ];;
poly := F / rels;;
Permutation Representation (Magma) : s0 := Sym(576)!( 1,289)( 2,290)( 3,291)( 4,292)( 5,293)( 6,294)( 7,295)( 8,296)( 9,297)( 10,298)( 11,299)( 12,300)( 13,301)( 14,302)( 15,303)( 16,304)( 17,305)( 18,306)( 19,316)( 20,317)( 21,318)( 22,319)( 23,320)( 24,321)( 25,322)( 26,323)( 27,324)( 28,307)( 29,308)( 30,309)( 31,310)( 32,311)( 33,312)( 34,313)( 35,314)( 36,315)( 37,334)( 38,335)( 39,336)( 40,337)( 41,338)( 42,339)( 43,340)( 44,341)( 45,342)( 46,325)( 47,326)( 48,327)( 49,328)( 50,329)( 51,330)( 52,331)( 53,332)( 54,333)( 55,343)( 56,344)( 57,345)( 58,346)( 59,347)( 60,348)( 61,349)( 62,350)( 63,351)( 64,352)( 65,353)( 66,354)( 67,355)( 68,356)( 69,357)( 70,358)( 71,359)( 72,360)( 73,379)( 74,380)( 75,381)( 76,382)( 77,383)( 78,384)( 79,385)( 80,386)( 81,387)( 82,388)( 83,389)( 84,390)( 85,391)( 86,392)( 87,393)( 88,394)( 89,395)( 90,396)( 91,361)( 92,362)( 93,363)( 94,364)( 95,365)( 96,366)( 97,367)( 98,368)( 99,369)(100,370)(101,371)(102,372)(103,373)(104,374)(105,375)(106,376)(107,377)(108,378)(109,424)(110,425)(111,426)(112,427)(113,428)(114,429)(115,430)(116,431)(117,432)(118,415)(119,416)(120,417)(121,418)(122,419)(123,420)(124,421)(125,422)(126,423)(127,406)(128,407)(129,408)(130,409)(131,410)(132,411)(133,412)(134,413)(135,414)(136,397)(137,398)(138,399)(139,400)(140,401)(141,402)(142,403)(143,404)(144,405)(145,433)(146,434)(147,435)(148,436)(149,437)(150,438)(151,439)(152,440)(153,441)(154,442)(155,443)(156,444)(157,445)(158,446)(159,447)(160,448)(161,449)(162,450)(163,460)(164,461)(165,462)(166,463)(167,464)(168,465)(169,466)(170,467)(171,468)(172,451)(173,452)(174,453)(175,454)(176,455)(177,456)(178,457)(179,458)(180,459)(181,478)(182,479)(183,480)(184,481)(185,482)(186,483)(187,484)(188,485)(189,486)(190,469)(191,470)(192,471)(193,472)(194,473)(195,474)(196,475)(197,476)(198,477)(199,487)(200,488)(201,489)(202,490)(203,491)(204,492)(205,493)(206,494)(207,495)(208,496)(209,497)(210,498)(211,499)(212,500)(213,501)(214,502)(215,503)(216,504)(217,523)(218,524)(219,525)(220,526)(221,527)(222,528)(223,529)(224,530)(225,531)(226,532)(227,533)(228,534)(229,535)(230,536)(231,537)(232,538)(233,539)(234,540)(235,505)(236,506)(237,507)(238,508)(239,509)(240,510)(241,511)(242,512)(243,513)(244,514)(245,515)(246,516)(247,517)(248,518)(249,519)(250,520)(251,521)(252,522)(253,568)(254,569)(255,570)(256,571)(257,572)(258,573)(259,574)(260,575)(261,576)(262,559)(263,560)(264,561)(265,562)(266,563)(267,564)(268,565)(269,566)(270,567)(271,550)(272,551)(273,552)(274,553)(275,554)(276,555)(277,556)(278,557)(279,558)(280,541)(281,542)(282,543)(283,544)(284,545)(285,546)(286,547)(287,548)(288,549); s1 := Sym(576)!( 2, 3)( 4, 9)( 5, 8)( 6, 7)( 11, 12)( 13, 18)( 14, 17)( 15, 16)( 19, 28)( 20, 30)( 21, 29)( 22, 36)( 23, 35)( 24, 34)( 25, 33)( 26, 32)( 27, 31)( 38, 39)( 40, 45)( 41, 44)( 42, 43)( 47, 48)( 49, 54)( 50, 53)( 51, 52)( 55, 64)( 56, 66)( 57, 65)( 58, 72)( 59, 71)( 60, 70)( 61, 69)( 62, 68)( 63, 67)( 73, 91)( 74, 93)( 75, 92)( 76, 99)( 77, 98)( 78, 97)( 79, 96)( 80, 95)( 81, 94)( 82,100)( 83,102)( 84,101)( 85,108)( 86,107)( 87,106)( 88,105)( 89,104)( 90,103)(109,127)(110,129)(111,128)(112,135)(113,134)(114,133)(115,132)(116,131)(117,130)(118,136)(119,138)(120,137)(121,144)(122,143)(123,142)(124,141)(125,140)(126,139)(145,181)(146,183)(147,182)(148,189)(149,188)(150,187)(151,186)(152,185)(153,184)(154,190)(155,192)(156,191)(157,198)(158,197)(159,196)(160,195)(161,194)(162,193)(163,208)(164,210)(165,209)(166,216)(167,215)(168,214)(169,213)(170,212)(171,211)(172,199)(173,201)(174,200)(175,207)(176,206)(177,205)(178,204)(179,203)(180,202)(217,271)(218,273)(219,272)(220,279)(221,278)(222,277)(223,276)(224,275)(225,274)(226,280)(227,282)(228,281)(229,288)(230,287)(231,286)(232,285)(233,284)(234,283)(235,253)(236,255)(237,254)(238,261)(239,260)(240,259)(241,258)(242,257)(243,256)(244,262)(245,264)(246,263)(247,270)(248,269)(249,268)(250,267)(251,266)(252,265)(289,361)(290,363)(291,362)(292,369)(293,368)(294,367)(295,366)(296,365)(297,364)(298,370)(299,372)(300,371)(301,378)(302,377)(303,376)(304,375)(305,374)(306,373)(307,388)(308,390)(309,389)(310,396)(311,395)(312,394)(313,393)(314,392)(315,391)(316,379)(317,381)(318,380)(319,387)(320,386)(321,385)(322,384)(323,383)(324,382)(325,397)(326,399)(327,398)(328,405)(329,404)(330,403)(331,402)(332,401)(333,400)(334,406)(335,408)(336,407)(337,414)(338,413)(339,412)(340,411)(341,410)(342,409)(343,424)(344,426)(345,425)(346,432)(347,431)(348,430)(349,429)(350,428)(351,427)(352,415)(353,417)(354,416)(355,423)(356,422)(357,421)(358,420)(359,419)(360,418)(433,550)(434,552)(435,551)(436,558)(437,557)(438,556)(439,555)(440,554)(441,553)(442,541)(443,543)(444,542)(445,549)(446,548)(447,547)(448,546)(449,545)(450,544)(451,559)(452,561)(453,560)(454,567)(455,566)(456,565)(457,564)(458,563)(459,562)(460,568)(461,570)(462,569)(463,576)(464,575)(465,574)(466,573)(467,572)(468,571)(469,514)(470,516)(471,515)(472,522)(473,521)(474,520)(475,519)(476,518)(477,517)(478,505)(479,507)(480,506)(481,513)(482,512)(483,511)(484,510)(485,509)(486,508)(487,523)(488,525)(489,524)(490,531)(491,530)(492,529)(493,528)(494,527)(495,526)(496,532)(497,534)(498,533)(499,540)(500,539)(501,538)(502,537)(503,536)(504,535); s2 := Sym(576)!( 1,148)( 2,150)( 3,149)( 4,145)( 5,147)( 6,146)( 7,153)( 8,152)( 9,151)( 10,157)( 11,159)( 12,158)( 13,154)( 14,156)( 15,155)( 16,162)( 17,161)( 18,160)( 19,166)( 20,168)( 21,167)( 22,163)( 23,165)( 24,164)( 25,171)( 26,170)( 27,169)( 28,175)( 29,177)( 30,176)( 31,172)( 32,174)( 33,173)( 34,180)( 35,179)( 36,178)( 37,184)( 38,186)( 39,185)( 40,181)( 41,183)( 42,182)( 43,189)( 44,188)( 45,187)( 46,193)( 47,195)( 48,194)( 49,190)( 50,192)( 51,191)( 52,198)( 53,197)( 54,196)( 55,202)( 56,204)( 57,203)( 58,199)( 59,201)( 60,200)( 61,207)( 62,206)( 63,205)( 64,211)( 65,213)( 66,212)( 67,208)( 68,210)( 69,209)( 70,216)( 71,215)( 72,214)( 73,229)( 74,231)( 75,230)( 76,226)( 77,228)( 78,227)( 79,234)( 80,233)( 81,232)( 82,220)( 83,222)( 84,221)( 85,217)( 86,219)( 87,218)( 88,225)( 89,224)( 90,223)( 91,247)( 92,249)( 93,248)( 94,244)( 95,246)( 96,245)( 97,252)( 98,251)( 99,250)(100,238)(101,240)(102,239)(103,235)(104,237)(105,236)(106,243)(107,242)(108,241)(109,265)(110,267)(111,266)(112,262)(113,264)(114,263)(115,270)(116,269)(117,268)(118,256)(119,258)(120,257)(121,253)(122,255)(123,254)(124,261)(125,260)(126,259)(127,283)(128,285)(129,284)(130,280)(131,282)(132,281)(133,288)(134,287)(135,286)(136,274)(137,276)(138,275)(139,271)(140,273)(141,272)(142,279)(143,278)(144,277)(289,436)(290,438)(291,437)(292,433)(293,435)(294,434)(295,441)(296,440)(297,439)(298,445)(299,447)(300,446)(301,442)(302,444)(303,443)(304,450)(305,449)(306,448)(307,454)(308,456)(309,455)(310,451)(311,453)(312,452)(313,459)(314,458)(315,457)(316,463)(317,465)(318,464)(319,460)(320,462)(321,461)(322,468)(323,467)(324,466)(325,472)(326,474)(327,473)(328,469)(329,471)(330,470)(331,477)(332,476)(333,475)(334,481)(335,483)(336,482)(337,478)(338,480)(339,479)(340,486)(341,485)(342,484)(343,490)(344,492)(345,491)(346,487)(347,489)(348,488)(349,495)(350,494)(351,493)(352,499)(353,501)(354,500)(355,496)(356,498)(357,497)(358,504)(359,503)(360,502)(361,517)(362,519)(363,518)(364,514)(365,516)(366,515)(367,522)(368,521)(369,520)(370,508)(371,510)(372,509)(373,505)(374,507)(375,506)(376,513)(377,512)(378,511)(379,535)(380,537)(381,536)(382,532)(383,534)(384,533)(385,540)(386,539)(387,538)(388,526)(389,528)(390,527)(391,523)(392,525)(393,524)(394,531)(395,530)(396,529)(397,553)(398,555)(399,554)(400,550)(401,552)(402,551)(403,558)(404,557)(405,556)(406,544)(407,546)(408,545)(409,541)(410,543)(411,542)(412,549)(413,548)(414,547)(415,571)(416,573)(417,572)(418,568)(419,570)(420,569)(421,576)(422,575)(423,574)(424,562)(425,564)(426,563)(427,559)(428,561)(429,560)(430,567)(431,566)(432,565); poly := sub<Sym(576)|s0,s1,s2>;Finitely Presented Group Representation (Magma) :
poly<s0,s1,s2> := Group< s0,s1,s2 | s0*s0, s1*s1, s2*s2, s0*s2*s0*s2, s0*s1*s2*s1*s2*s0*s1*s0*s1*s2*s1*s2*s0*s1, s0*s1*s0*s1*s0*s1*s2*s1*s0*s1*s0*s1*s0*s1*s2*s1, s0*s1*s0*s1*s2*s0*s1*s0*s1*s0*s2*s1*s0*s1*s0*s1*s0*s1, s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2*s1*s2 >;References : None.