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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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function randchar(str) {

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  var i = Math.floor(Math.random() * str.length);

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  while (i == str.length)

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    i = Math.floor(Math.random() * str.length);

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  return str[i]; 

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}

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hexdigits = "0123456789abcdef";

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function randlight() {

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  return    randchar("cdef")+randchar(hexdigits)+

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            randchar("cdef")+randchar(hexdigits)+

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            randchar("cdef")+randchar(hexdigits)

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}

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function randdark() {

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  return    randchar("012345789")+randchar(hexdigits)+

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            randchar("012345789")+randchar(hexdigits)+

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            randchar("102345789")+randchar(hexdigits)

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}

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document.write('<style type="text/css">\n<!--\n');

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document.write('body {\n  color: #'+randdark()+';\n  background: #'+

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               randlight()+';\n}\n');

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document.write('a:link {\n  color: #'+randdark()+';\n}\n');

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document.write('a:visited {\n  color: #'+randdark()+';\n}\n');

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document.write('a:active {\n  color: #'+randdark()+';\n}\n');

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document.write('a:hover {\n  background-color: #'+randlight()+';\n}\n');

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document.write('pre {\n  color: #'+randdark()+';\n}\n');

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document.write('tt {\n  color: #'+randdark()+';\n}\n');

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document.write('code {\n  color: #'+randdark()+';\n}\n');

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document.write('var {\n  color: #'+randdark()+';\n}\n');

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document.write('div.func {\n  background-color: #'+randlight()+';\n}\n');

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document.write('div.example {\n  background-color: #'+randlight()+';\n}\n');

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document.write('div.chlinktop {\n  background-color: #'+randlight()+';\n}\n');

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document.write('div.chlinkbot {\n  background-color: #'+randlight()+';\n}\n');

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document.write('pre.normal {\n  color: #'+randdark()+';\n}\n');

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document.write('code.func {\n  color: #'+randdark()+';\n}\n');

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document.write('code.keyw {\n  color: #'+randdark()+';\n}\n');

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document.write('code.file {\n  color: #'+randdark()+';\n}\n');

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document.write('code.code {\n  color: #'+randdark()+';\n}\n');

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document.write('code.i {\n  color: #'+randdark()+';\n}\n');

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document.write('strong.button {\n  color: #'+randdark()+';\n}\n');

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document.write('span.Heading {\n  color: #'+randdark()+';\n}\n');

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document.write('var.Arg {\n  color: #'+randdark()+';\n}\n');

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document.write('strong.pkg {\n  color: #'+randdark()+';\n}\n');

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document.write('strong.Mark {\n  color: #'+randdark()+';\n}\n');

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document.write('b.Ref {\n  color: #'+randdark()+';\n}\n');

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document.write('span.Ref {\n  color: #'+randdark()+';\n}\n');

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document.write('span.GAPprompt {\n  color: #'+randdark()+';\n}\n');

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document.write('span.GAPbrkprompt {\n  color: #'+randdark()+';\n}\n');

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document.write('span.GAPinput {\n  color: #'+randdark()+';\n}\n');

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document.write('b.Bib_author {\n  color: #'+randdark()+';\n}\n');

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document.write('span.Bib_key {\n  color: #'+randdark()+';\n}\n');

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document.write('i.Bib_title {\n  color: #'+randdark()+';\n}\n');

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document.write('-->\n</style>\n');

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