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

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#Example: "11gp-PG-i" . . . based on: examples/pga_11gp
#Descendants of C11 x C11 x C11
#vars: F, procId;
#options: OutputLevel
F := FreeGroup("a", "b", "c");
procId := PqStart(F : Prime := 11);
#comment: set a different print level by supplying <OutputLevel>
PqPcPresentation(procId : ClassBound := 1, 
#sub <OutputLevel> for <1> if set and ok
                          OutputLevel := 1);;
PqComputePCover(procId);;
PqPGSupplyAutomorphisms(procId, [ [[ 2, 0, 0],
                                   [ 0, 1, 0],
                                   [ 0, 0, 1]],

                                  [[10, 0, 1],
                                   [10, 0, 0],
                                   [ 0,10, 0]] ]);;
PqPGConstructDescendants(procId : ClassBound := 2,
                                  CapableDescendants,
                                  StepSize := 1,
                                  RankInitialSegmentSubgroups := 3);;