GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
1 2gp 2 #prime 6 #maximum class 1 #print level {a, b} #generating set { [b, a, a], (a * b * a)^4 } #defining set of relations 0 #exponent 2 #save option 2GP #file name 0 #exit