GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
1 #menu option B(2,8) #name of group 2 #prime 10 #maximal class of p-quotient 1 #output level {a, b} #defining generators { } #relations 8 #exponent law to be satisfied 2 #menu option to save B28 #file name 0 #exit from program