GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
#Example: "3gp-PG-x-i" . . . based on example from Werner
#A `by hand' descendants example
#vars: F, procId;
#options: OutputLevel
F := FreeGroup("a", "b");
procId := PqStart(F : Prime := 3);
#comment: set a different print level by supplying <OutputLevel>
Pq(procId : ClassBound := 1,
#sub <OutputLevel> for <1> if set and ok
OutputLevel := 1);;
PqPCover(procId);;
PqPGSupplyAutomorphisms(procId, [ [[1,1],
[0,1]],
[[0,1],
[1,0]] ]);;
PqPGExtendAutomorphisms(procId);;
PqPGConstructDescendants(procId : ClassBound := 3,
BasicAlgorithm);